They mean he was created being before Adam and Eve. Their proof texts are:
Proverbs 8:22
King James Version
22 The Lord
possessed me in the beginning of his way, before his works of old.
22 Jehovah
produced me as the beginning of his way, NWT 2013
NWT footnote:
“Produced me.” Heb.,
qa·naʹni; TLXX(Gr.,
eʹkti·senʹ me)Sy,
“created me”; Lat.,
pos·seʹdit me, “possessed me.” See
Ge 14:19 ftn.
New International Version
"The LORD
brought me forth as the first of his works, before his deeds of old;
New Living Translation
“The LORD
formed me from the beginning, before he created anything else.
English Standard Version
“The LORD
possessed me at the beginning of his work, the first of his acts of old.
Berean Study Bible
The LORD
created me as His first course, before His works of old.
New American Standard Bible
"The LORD possessed me at the beginning of His way, Before His works of old.
New King James Version
“The LORD possessed me at the beginning of His way, Before His works of old.
King James Bible
The LORD possessed me in the beginning of his way, before his works of old.
Christian Standard Bible
"The LORD acquired me at the beginning of his creation, before his works of long ago.
Contemporary English Version
From the beginning, I was with the LORD. I was there before he began
Good News Translation
"The LORD created me first of all, the first of his works, long ago.
Holman Christian Standard Bible
The LORD made me at the beginning of His creation, before His works of long ago.
International Standard Version
"The LORD made me as he began his planning, before his ancient activity commenced.
NET Bible
The LORD created me as the beginning of his works, before his deeds of long ago.
New Heart English Bible
"The LORD created me in the beginning of his way, before his works of old.
A Faithful Version
The LORD possessed me in the beginning of His way, before His works of old.
Aramaic Bible in Plain English
“Lord Jehovah created me at the beginning of his creation and from before all of his works.”
GOD'S WORD® Translation
"The LORD already possessed me long ago, when his way began, before any of his works.
JPS Tanakh 1917
The LORD made me as the beginning of His way, The first of His works of old.
New American Standard 1977
“The LORD possessed me at the beginning of His way, Before His works of old.
King James 2000 Bible
The LORD possessed me in the beginning of his way, before his works of old.
American King James Version
The LORD possessed me in the beginning of his way, before his works of old.
American Standard Version
Jehovah possessed me in the beginning of his way, Before his works of old.
Brenton Septuagint Translation
The Lord
made me the beginning of his ways for his works.
Douay-Rheims Bible
The Lord possessed me in the beginning of his ways, before he made any thing from the beginning.
Darby Bible Translation
Jehovah possessed me in the beginning of his way, before his works of old.
English Revised Version
The LORD possessed me in the beginning of his way, before his works of old.
Webster's Bible Translation
The LORD possessed me in the beginning of his way, before his works of old.
World English Bible
"Yahweh possessed me in the beginning of his work, before his deeds of old.
Young's Literal Translation
Jehovah possessed me -- the beginning of His way, Before His works since then.
The context of Proverbs 8 is about the role of Wisdom in creation.
Wisdom is one of God's attributes, so it makes no sense to say it was created or made.
PS NWT mean their New World Translation of the Bible.