Yes, that is proof that by 250 AD heresy had gripped some elements of the Church. They had to wait until all the early Disciples had died out for the belief that Jesus was God to take hold.
Then, as now, some were confused.
The scriptural evidence and testimony of the early church fathers (to include Polycarp who was a disciple of John) proves otherwise. Just saying what you say a bunch of times does not make it valid.