It's true that Nadal started with painkiller injections in the foot just at RG 2022. The Spaniard also proceeded to get a nerve ablation after RG 2022.
Nadal was limping (foot injury) against Shapovalov at Rome 2022:
Madrid 2022 was Nadal's first tournament after a rib fracture that had let him absent from the tour for 6 weeks after his IW injury. Analogously, Novak got injured in the kmee at RG 2024 and then reached the W 2024 final. You wouldn't say Novak was perfectly healthy the first tournament he played after his injury, right? If Novak wasn't completely healthy at W 2024 because it was the first tournament he played after an injury, then Rafa wasn't perfectly healthy at Madrid 2022 because it was the first tournament he played after a long injury. Unless you want to display a double standard logic.
Nadal wasn't in his best physical shape in Madrid 2022 due to a combination of factors, such as the advanced age and recovery from an injury. He was in better form at RG 2022 because he numbed his foot with painkiller injections and had passed enough time from his rib fracture.
In this interview from 2022, Rafael acknowledges that he took his personal doctor with him at RG 2022, not in Rome or Madrid:
How Rafael Nadal managed to win his 14th grand slam on his chronically injured left foot is anybody's guess. Read more here.
au.sports.yahoo.com
The empirical confirmation that Nadal underwent a radiofrequency nerve ablation after RG 2022 and before W 2022.