Everything points towards Gohan continuing to train after the Tournament of Power in the manga; from expressing his desire to continue evolving after regaining his battle sense, to remaining Earth's mightiest defender, to showing up months after the tournament even stronger than before despite also maintaining his studies and career as a professor. The only training Gohan from Super Hero has claimed to have done is practicing the Special Beam Cannon in his downtime.
Most damning of all, though, is his willingness to use Super Saiyan, uncharacteristic of the Gohan from the manga who explicitly denounced his Super Saiyan form and his Saiyan upbringings altogether in favor of his Earthling side.
Besides, the Super manga, much like Toriyama's original story, portrays his Ultimate "form" as equal with his normal state through and through. Gohan in the manga is always Ultimate Gohan, regardless of his haircut or his personality, because he is Ultimate Gohan.