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It looks like the original code was a bad copy-paste from H5 HAL. ETH_DMATXDESC_LS and ETH_DMATXDESC_TTSS are flags from the DESC0 register. This allows to effectively et the TX timestamp properly when there is one.
I wouldn't be surprised if more of such mix-ups of DESC0/1 vs., DESC2/3 would be to be found in the file but I didn't really review this.