It’s a long-established fact that Lithuanian Rabbis (better known as gedolim™ or giants) have de facto become the Rebbes of the yeshivishe world, including when it comes to brochas (blessings). The Rabbis have been put on such a high pedestal that their followers can’t conceive that they may be making mistakes. Let alone turning senile.
Perhaps below you will find a hint. In this video that was posted on Life in Israel, you can see that Rav Chaim Kanievsky does not have a clue about what Beit Shemesh is, one of the major Jewish centers in Israel. He even asks if it is in America!
That Beit Shemesh is situated in Israel should be obvious since Tenach is full of references to Beit Shemesh:
- Joshua 15:10
- Joshua 19:22
- Joshua 21:16
- Shoftim 1:33
- Shmuel I 6:19
- Melachim I 4:9
- Melachim II 14:11
- Divrei Hayamim I 6:44
- Divrei Hayamim II 25:21
- Divrei Hayamim II 28:18
Now if you will argue that haredim don’t learn much Tenach, they still should know their Gemara. Well, it happens to appear several times, not including the Yerushalmi:
- Sotah 35a
- Avodah Zarah 24:2
So there are two possibilities: either our Gadol Hador™ doesn’t know his sources, which would be unforgivable for a ‘gadol hador’…or he is turning senile.
In which case we should probably disregard any psak or cherem issued in his name from now on.
(Still, you could perhaps argue that he was having a bad day. Well, in that case, we should probably disregard any psak or cherem issued in his name since he was born since we don’t know if he was having a bad day or not.)