What I said was you can view these traders without trading on the platform -- some leave contact details (phone, email, even site or TG) and you can usually enquire outside. That's how I found my current main p2p traders. Not sure if those platforms still allow you to leave your contact details though. Usually it's surreptitiously written as a "send me a msg when you trade so I can respond immediately".
It's just one way to find traders. I'd stick to a reputable one from this forum to start.
This time around, most exchanges no longer allow the user to add their number to their trade, and even when you click on the seller's order, you can't see their number. Now you can only communicate with one another when you have placed an order, and that's when the chat box will be open for you to exchange contact information.
I believe one of the reasons this was changed was as a result of others being scammed outside the exchange as a result of dealing via contact alone. It's hard to get a trusted dealer, especially when escrow is not involved, so I will either give the OP the second choice, which is finding a trusted dealer here in the forum.