I wouldn't say they were consistent.
He made a lot in his first few months at the club and he's made a lot in his last few months. In between he didn't really make that many, or at least no more than many keepers do. Indeed for a few months at the start of this season he was one of the best performing keepers in the league. So he's been a bit all over the place and it's really just those two periods bookending his time here (so far) that he's been really poor. In saying that he seems to be improving again in his last few games, although that may just be that he's had less to do.
If he could consistently stay at the level that he was at in between roughly November 2023 and December 2024 I'd say he was low on the list that needed to be replaced. I wouldn't be confident that he'd be our long term keeper or anything like that, but he'd easily be able to do the job for another year or two while we focus on other areas. But having two such poor periods in less than two seasons (and only being 'ok' for most of the remaining) means he probably does have to be fairly high up on the list.