ive been killed pretty quickly after going down, as in didnt even get to see myself on floor lol BUT what you are saying is that when they said no ohk, all they meant is that nothing will make you spectate until the next respawn but you can still go down to incap with 1 shot?
They said at one stage "no one-shotting people" - but they've adjusted that over time and playtesting and the final result was that "you should never die without having some idea how it happened." They've mostly achieved that (but I'll admit, only mostly, and enemy AI has more accurate weapons than a human player can realistically manage)
A heavily buffed Barnett can one-shot a Heavy with one or two bonus pips or a fully-buffed Light, if you land a headshot. It's HIGHLY unlikely to have that happen though. not impossible, but you're not going to get that perfect setup very much.