All of the things you spoke of, including his regeneration JUTSU (it was not an ability) cost chakra in order to use. No one is trying to trick you, the author himself has stated multiple times over more than a decade that Hiruzen is the strongest Hokage in histroy.
He wasn't called the most well-rounded, but the master of all forms of shinobi combat, which how he earned the nickname "The Professor". And Hashirama was never said to have abnormal strength, much less brute strength. Hiruzen was stated by the author to be stronger than all other Hokage without a doubt in each databook.
I just don't get why people stupidly argue with Kishimoto himself. "You're wrong about your own characters!!11(one)1"