I think the Judge's comments are to guide the AUDIENCE/Public to vote. The performance and the VOTES are the only factors that count whether they will be in the safe / dangerous zone.
And the JUDGES opinion hardly matters.
The more fans vote for their fav idol. He/ She will be safe.
Clear example was Hiten and Gauri last year...the fans kept voting for them and they made it to the last 3. It was obvious the couple couldn't dance....😆
Actually in Nach Baliye they do combine judges scores and audience scores and the results clearly reflect that. Hiten Gauri were perhaps almost always one of the highest vote gainers, that is why they survived so long. But for Jhalak it is not at all clear.