According to Clark Moody's dashboard, the rate over the past 30 days has been:
[ 6.3 tps ]
So 7 does not seem like a myth at all, it seems totally accurate.
An average is not a maximum. When someone says bitcoin "only" does 7 tps they are wrong because it does a lot more than that on a daily basis. It is like saying a pool is only 7 feet deep when that's only an average and the deep end is 13. The word "only" (and its synonyms) is what makes the difference.