Again, they are shocked at how sane (conservative) he sounds on some issues (like this one)... they are doing exactly what you say they aren't. This is just a sign that you (not you personally, leftists generally) simply do not pay attention to anyone with an opinion that differs from yours. MSDNC says that conservatives still hate Fetterman, so say you too. Rachel Maddow points out how "crazy" Fetterman sounds, but still says all righties just "hate" them some Fetterman... yet the Talking Head "Magats" are showing the footage and talking about how Fetterman may become a target of the left if he keeps talking like this (while pointing out that he suddenly sounds sane rather than blurting Fetterwoman out).
Conservatives remember the Fetterwoman moments, so the trust they have in this sudden conservative bent only goes as far as they can throw him... I get that.