There is another video on that same channel which demonstrates a more typical use case -- a signal with glitches, shown in regular sweep mode. Compared to a Rigol DHO's web interface, the frame rate that Siglent can display in the web broswer is not impressive.
I have been happy enough with my SDS800X HD's web interface. I have used it frequently to take screenshots, and sometimes to take a peek at a long-term measurement without leaving the sofa. But I would not use it as my main user interface at the bench (to get a larger screen without a dedicated video output).