Condo seller didnt disclose dry rot

Hi all, I am likely going to speak to the lawyer who helped me close the sale about this but I also wanted to get some advice from reddit to see if it's even worth spending the time on or if other people have dealt with something similar. I just bought a condo (first home!) and we brought in a plumber to replace toilets and sinks. When the plumber went to inspect the toilet/the area behind the shower he said there was evidence of dry rot and that someone had recently done work to cover it up. It is behind a seemingly new wall decor/water proof thing and sealed up. We inspected it more closely and it really seems that the plumber is correct. To fix the dry rot behind the wall would likely cost a few thousand if not more. I wanted to see if there was sufficient reason/evidence to go after the seller for this. Here are the circumstances/details:

1. The condo was inspected. It doesn't seem like this is something that a normal inspection would catch anyways.

2. The seller did not provide a property disclosure statement because he said that he had been renting the building and knew nothing about the condition of the condo. This is false as since I've gained access to the neighbourhood/complex chat app it's pretty clear that he was active owner and knew quite a bit about the condition of the overall complex (he made several posts complaining about it and even suggested that there might be dry rot in the roof). I have screenshotted all of these posts

3. We've brought three plumbers into the condo. The third one was the one who noticed. The other two didn't notice, so it was well hidden

4. There was work done to cover this up. The owner/seller would've had to have hired someone to do this, so it sure seems like he knew this was there and did not disclose.

I think this counts as a latent material defect and it was the seller's responsibility to disclose it. There seems to be (in my mind) pretty clear evidence that the seller was aware of the defect, did work to hide it, and then did not disclose it. But also, I am not at all an expert in real estate law. Is there a case here get the seller to cover the cost of repairs? Or am I wasting my time by going to my lawyer. The location is North Vancouver, BC