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PPTP is obsolete and fundamentally insecure. And that isn't news but known at least since 1998 (!): https://www.schneier.com/academic/pptp/

It is unlikely that it would be blocked in China since eavesdropping is easily possible.

(Vanilla) OpenVPN is blocked in China, likewise is IPsec and L2TP. SSTP can also easily be detected via Active Probing but I'm not sure if the GFW currently does that.

The GFW(Great Firewall) has blocked many protocols, such as IPSec, L2TP/IPSec, PPTP and OpenVPN.

SSTP (tunneling via HTTPS) is the interesting one.

a vpn client isn't very useful without a server to connect to, so I assume that means win10 with a vpn client isnt a problem.

have any more technical details on how this is an issue?

He was sentenced for selling "VPN software", which Win10 has built-in. Did he also run a VPN server (not mentioned in the article)?