It is! In the video I include in the spoiler, the guy goes into how it works.
TL;DW: Temu ships from China using "developing country" rates, so it's literally cheaper to ship things from China than within the US, so there is literally no way for a local producer to be able to ship for less than China pays to ship internationally, but the USPS still has to process all that stuff, so every time you buy from Temu you're basically screwing over your own country if you're in the "developed country" block because you
are still paying for shipping, just indirectly.
Put another way, China has a way to exhaust our postal service's resources/tax funding because Americans order cheap shit like this:
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