Those can work...in a way, and I do have something similar, but it has a problem. I bought one of those many years ago when we didn't have many good options and Tesla was continually sold out of any type of 30A adapters for years. Now there's a much better way, so we don't have to use stuff like that.
The problem with it is that it's making you use the Tesla 14-50 plug, and it's a chip inside that plug, which tells the car what the amp limit should be. So in this case, that's going to be higher than what you should be using from a TT-30. Someone would need to remember each time they use it to turn down the amps to only 24 or less as it is ramping up. Having to rely on that human memory factor just isn't something you'll see recommended around here much. The TT-30 adapter that EVSEAdapters.com sells is built from an original Tesla 30A type, so it properly sends the car the signal to use 24A maximum.