I’m not sure what the “free regulation” encompasses; id conclude that only applies to regulating the watch, and not any service or long term care afterwards.
The NH35 is a very robust entry level movement. However, low as the odds are of an issue if it does malfunction, you’re looking at $250 at minimum to fix it. That’s 38% of the $645 new value of the watch; and it’s not a Rolex, so odds are you’ll be “upside down” like the OP by the time it needs maintenance.
I personally wouldn’t order it, but I’m not big into Lum Tec. It’s your watch so buy what you like, just know the risk.