I think he meant US deaths because his source is a list of WWII deaths by country. That is actually fairly accurate: 170K direct, he assumes ~2x if you count indirect, so ~400K which is indeed approaching total US WWII casualities (460K or so).

Even if you don't count or differently count indirect deaths, I'd still say going from 0 to 170K in 6 months with no end in sight definitely constitutes "approaching". We'll get there before this is all over, for sure.