John the apostle was also the apostle that Jesus said he loved. He was the last of the apostle's who died around 99 or 100 AD.
According to early tradition, Revelation was composed near the end of Domitian's reign, around the year 95 AD. Others contend for an earlier date, 68 or 69 AD, in the reign of Nero or shortly thereafter majority of modern scholars accept one of these two dates, with most accepting the later one
That's great. It still doesn't settle the debate. The writer of Revelation certainly didn't identify himself as "the apostle Jesus loved" or any of the other types of nuance that John the Apostle was known for.
All we know is that somone named John wrote Revelation on the island of Patmos.
Why should he have identified himself that way? The people he was writting to knew who he was.