Missing in NKJV

The following numbers are used to describe the omissions found in the NKJV, However, my actual count differs from this meme which is normally posted:

23 omissions of “blood” – Found 3 omissions and 2 added
44 omissions of Repent – Found 21 omissions in 19 verses
50 omissions of “heaven” – Found 1 Omission in the Entire NT – Did not do OT yet.
22 omissions of “hell” – Found them all

Does anyone know what criteria they used to arrive at these numbers?