Specs on a device describe it's range of capabilities, and don't determine how you use it.
The IPV D2 is designed to be able to work at up to 75 watts IF the chosen coil resistance allows, and will function (although maybe not up to 75 watts) on any coil that falls within the given range. Too low or high a resistance, and it should refuse to fire. (Don't have one of those, so can't say exactly what the display will show for either case, but typically something like "lo Ω or NON, respectively.
Your STM with the 0.5 coil is safely within the IPV range, so should not be a problem.
The STM "rating" is a tad different. The resistance should be as marked, although manufacturing tolerances may result in it being slightly off. But 30W is not necessarily where you should set your mod. Best practice is to start at the low end and work up in steps until you get the vape results that you like. And going over 30 watts on it may cause problems due to not enough air flow over the coil for a good vape, and likely burning the wick.
Unless you have the right coil / head for TC, with the right type of wire, do NOT use TC mode. Most non-TC coils are Kanthal, and TC does NOT work with Kanthal. Most TC coils are well below that 0.5 Ω.