That's what domain fronting is for, and even though the GFW attempts to filter by SNI, genetic algorithms like Geneva are able to find workarounds: https://geneva.cs.umd.edu/papers/foci21.pdf
Since the project at the OP link is mostly/initially aimed at Russia, in my own experience, it's not always just DPI — it's often DPI combined with a firewall. Roskomnadzor can order to block access to a domain, but then they can also specify an IP or a subnet instead. For example, that's what happened when they tried to block Telegram, which does not use DNS at all.
