They have not provided you with any reason to believe them. They won't even tell you
where they're located lol.
This was a common growth hack for exchanges. When a new exchange launched they wanted to feign liquidity to establish a sense of credibility. They literally copied feeds from peer exchanges until they bootstrapped.
After all, why would anyone trade at an illiquid exchange? How do you get the first people onboard? You pretend you already have a lot of people onboard. More volume = more credibility.
The question you should ask yourself is if nobody is looking, why would they ever stop?
[note] by "growth hack" I mean literally a felony in any other context, but in the crypto space shrug who cares I guess. After all in which jurisdiction would you even sue them lol. Thanks to the "beauty of the blockchain" they won't even tell you where they're based.