Mydenturist mouthguard?

Has anybody seen these?

https://mydenturist.shop/products/custom-dental-night-guard-soft-3mm?srsltid=AfmBOoqE5wc_NZfQqOkUj-3pFqUDOy3ZH18LFvvmiIPqVM88sU3-E8GT

I bought one a few days ago- haven't moulded them yet as I keep on reading now that these can make TMJ worse. I'm not sure whether I should return... I whatsapped their company and they said they're good for TMJ, but who knows, as of course they want the business.

Masseter botox has been a god send and I have no pain now even though I am pretty sure my bite still feels off. Sometimes it feels fine and other times it feels like my teeth are in the wrong place...

I still wake up clenching a bit (only had my second round of botox a couple of days ago), and I have noticed my teeth are losing their enamel at the bottom. I really wanted to keep them protected, I just really don't want to screw my TMJ up even more.

Thanks in advance ☺️