The intel is out in the open between the lines. But who's looking there.
To understand why religious Jews are taking this seriously, it's important to know that Rabbi Chaim Kanievsky was considered one of the two or three top rabbis of the ultra-Orthodox Jewish community in Israel.
Top men.
"There is a potential Messiah in every generation and there are righteous men who know precisely who it is. This is, of course, true in this generation."
"Four score and seven minutes ago, we began this adventure with our most excellent friends, Bill and Ted. These two fine gentlemen are dedicated to the proposition that was true in my day, as it is in theirs: be excellent to one another, and PARTY ON DUDES!" ~ Abraham Lincoln
"Dude" is spelled דוד, who is a regular guy.
There is a false messiah in every generation ... because satan doesn’t know the day or hour the true Messiah comes to gather His to Himself and return to the Father’s House. Because these Rabbis do not believe Jesus IS their true Messiah they are ripe for signs and wonders from the false messiah and ready to sign a pact with death.