This is correct, but this comment isn’t really relevant for this part of this tutorial. There is a separate tutorial on (using a HLS stream IP with DMA)[Tutorial: using a HLS stream IP with DMA (Part 1: HLS design)] which covers TLAST.
TLAST was also mentioned when discussing the hardware design in the first part of this tutorial: PYNQ DMA tutorial (Part 1: Hardware design).
Cathal