Going by Fabien Sanglard's cheat sheet (who I trust uncritically) https://fabiensanglard.net/usbcheat/index.html it looks like 3.2 actually is a broader term than expected. Maybe there was some awful attempt at backwards compatibility? Or forwards?
Also, according to that table, "USB4 Gen 2×2" is a downgrade on "USB 3.2 Gen 2x2", since the cable length is 0.8m instead of 1m for the same speeds. Which is uhh unexpected.
USB 1+2/3/4 are basically unrelated standards under the same USB umbrella. USB4 especially is just Thunderbolt/PCIe x4 with features. If Betamax was branded as "VHS 2.0" instead of being a separate standard it would have been felt similar to the USB4 situation.