You are right, that first photo is old. It was apparently another Indian naval ship on fire, likely an aircraft carrier. As for the second photo, it could be a stand-in.I'm not sure what "deck 2 and 3" means either; as you see, does it mean above the main deck or from the keel upwards?
But at present that is the only firm information we have.
I haven't come across any pictures showing the fire or the results of it on social media or on the major Indian defense tracking forums.
The picture with the weibo account tag is a picture that I haven't seen posted on any other forum or used in any news reports about the fire that I've seen (and I've been tracking a few Indian defense forums and the news feed for the fire), so I'm not even sure if it's depicting the ship at all or even if it's showing MDL. Out of interest, where did you find that picture in the first place?
[edit: doing a reverse image search of that picture, I'm 100% convinced it isn't of the P15B fire -- it's been featured in articles going back as far as 2015. I'm not sure what the original event was, but it certainly of the P15B]
The TV report one seems to just be a generic stand in picture of a "fire," and not intended to represent the actual ship.
In any event, it's hard to keep track of all the photos of Indian naval ships on fire or Indian air force crashes because they happen so damn often.
But yes, at a minimum, the commissioning date will be pushed further back. Delays and accidents are quite the norm for India, naturally.