I understood his comment as directed at the people Rav Sorotzkin was railing against.
I don't understand why Rav Sorotzkin was railing against anyone. I plan on voting for AS, but its not because I saw any endorsements from any rabbonim. In fact, I actually haven't seen a single endorsement until his video, unless you consider an ad with a rubber stamp an "endorsement". In light of that, is it really terrible to oppose AS?
If it's so important to the rabbonim, why wait until days before the election for one Rav to endorse AS? Why's it so difficult to simply come out and say so?
On a different point, after listening to a 15 minute speech (without fast playback options), I did not hear a single reason to vote for AS other than the fact that Rabbonim said to do so. For many, that is enough of a reason to vote for AS, but does the community not deserve to hear a single reason why they thought AS is an important candidate to vote for?
Are we too dumb to understand?
Is there something that needs to be hidden?
Are they afraid that someone may disagree?
Is it possible that they made their endorsements based on facts they were provided, but other experts may disagree with those facts?