There's hardly any commentary on 1 John 5:1 in the WT library, but where there is we find some real twisting of logic:
*** w86 7/15 p. 23 par. 12 Always Display Love and Faith ***
"John next shows what loving God really means. (Read 1 John 5:1-5.) First, the apostle points out that “everyone believing that Jesus is the Christ” (the Messiah, or Jehovah’s Anointed One) “has been born from God,” or been spirit-begotten by Jehovah. Moreover, everyone who loves the Begetter, Jehovah, loves anyone else “born from that one.” Yes, all of God’s anointed children love him and would be expected to love one another. Such brotherly love also is characteristic of the “great crowd” of “other sheep” having earthly hopes."
So it starts by saying what the Bible says, that all believers are anointed, then without any sort of explanation makes some spurious and unrelated distinction between the anointed and the Great Crowd.
*** g74 8/22 p. 28 Must You Be Born Again? ***
"These things help us to understand the apostle John’s statement about “everyone” believing in Jesus as being born from God. (1 John 5:1)"
This technique of adding spurious quotation marks to change something to being symbolic is not new. They even do this in the Bible at 1 Sam 28:15 where Saul is speaking to "Samuel". There are no quotations in the Hebrew but WT doesn't seem to worry about such minor things if it suits their (current) agenda.