As per the current plot of Superman & Lois season 4, Clark Kent's powers are deteriorating and it is happening rapidly. Over the course of the season, it becomes evident that Superman's powers are diminishing. He struggles with fundamental skills like flying and hearing, which were formerly second nature to him.

While Superman & Lois was made with the conscious decision not to tie it to the wider Arrowverse, the end of the rest of the franchise in quick succession left it as the only vest