Only supressed his ability to utilize his cleave but Sukunas physical power was not impacted. He sent Yuji across the city on some Superman shyt and Yuji came right back
Him getting Sukunas powers was set up from day one that's not bad writing. Gege wouldn't have thrown that line in there way back when for no reason. Gojo getting got like that was Gege looking at them fan reactions like "oh yall like Gojo more than everyone else aye? Bet
" We also haven't been shown everyone's training during that month timeskip. We know there was some type of plan because Gojo told everyone to stay away.