Chances are that they expected this all along. Ref: B Raman's story about detonators and previous instances of similar "we presented the evidence but but...".
So they sounded the planks, figured out what would result if they came out with the evidence or presented it to the Khan and how it would be discredited.
Instead they kept quiet. Waited for the Laras and Al-Habibis to come out with the planted stories.
Then hit back with a pointed, surgical strike. Again, note - Re: Nirmala Ma'am's comment about "we know about the pilot" (paraphrasing). The MOD/GOI knows far more than it let out today.

That information too has been kept carefully.
This truly is hybrid war 101 and we are caught up in it. Instead of showing all your cards upfront, the GOI is reacting carefully & pointedly to attacks on its & IAF's credibility by releasing the exact amount of info. using our own resources to the optimal (multiple media sources, so one media house can't suppress it by itself as was done in the cash for votes scam, and also providing pointed info to credible folks like in the veterans community).
While mistakes have been made initially, they are doing better now.
Very interesting, given the power differential in managing a propaganda campaign, the GOI/ IAF have chosen this method to make its point and also, prevent classified capabilities from coming out.