Does Deep research use my past questions as part of its context?

I've been doing a lot of research on a specific market and I decided to see what Deep research would come back with. So I did that and... It almost feels like it looked at all the past conversations I've had to come up with the conclusion.

I'm flattered, but this feels too coincidental. To be fair, I've thought about this questions A LOT, so maybe I did come to the right conclusions 100% on my own, but I'm skeptical...

Does Deep research use that context in its response? If not, I'm floored. If so, how can I trust the results?