Yes, those are blast barriers. The problem is that Vikrant should have been designed properly to begin with. Instead, the Indian Navy thought that they could get away with cutting corners, and that just doesn't work when it comes to carrier operations. The Americans have the most experience in the world with carriers, but they tried to get fancy with Ford, and even they end up paying the price for it. The Indians did a worse job with Vikrant so their problems are going to be much worse. I would say that, until it gets a major overhaul, Vikrant should be regarded more as a fancy showpiece than as a practical war machine.