Yes some scientists are speaking out but they werent exactly unaware of the speakers beliefs, yet the speakers were invited to be the speakers. Shows how much importance and inflence these scientists, who are speaking, out have.
Note these speakers are not riff-raffs either, they are academics holding important academic positions, they got promoted to these positions. Lending support to these ideas likely had a thing or two to do with the promotions.
Now imagine which kind of scientists will get the government grants, the vedic helicopter running on cow piss or the other kind.
Also imagine the motivation level of a indian scientist in USA or Europe to come back to india and take up an academic position unless of course they happen to subscribe to such ideas.
"Some academics at the annual Indian Science Congress, inaugurated by Prime Minister Narendra Modi, publicly dismissed the discoveries of Isaac Newton and Albert Einstein."
Yeah some scientists are calling them out, but that does not take away the fact that such crackpot ideas are being proselytized by the speakers at one of the premier venues of "science"