Absolutely! I know at least one of them is going to give a good TH, it's merely a question of what kind of TH. For what very little it did, Throat Hit Plus' meagre throat hit was quite smooth, but it's useless given the quantities you need to use to get any kind of boost out of it.
Flash will again be something different -- I don't even know what goes into it, as FlavourArt don't even give a hint, but since it's designed to be a nicotine replacement first and foremost it must have a TH of some sort, so I have hopes for that one. The last one, Diablo Loco, is a highly concentrated capsaicin solution meaured at 500,000 SHU. (Translation: Police-grade pepper spray, red savina pepper, and just shy of the kind of heat in Blair's 2AM Reserve hot sauce.) It's intended to be diluted way down before use as an additive. This one I am not quite so sure about. I've vaped a home-made black pepper extract and the TH was sharp and harsh -- and of course, peppery. But I'm wagering Diablo Loco is made from diluted pure capsaicin crystals, which should be all heat and no flavour. How it hits the throat however remains to be seen.
Furthermore, it may be possible to blend one product with another to achieve something closer to an ideal TH if none of them manage to get that close on their own. (i.e. 0.5 to 1 drop of Diablo in one 6ml bottle of THP might work.)