They just need to identify that you might have a Twitter account, and then show that you've been using a VPN. Which given their judicial standards, probably won't be hard... Also, good chance they move on to banning VPNs outright anyway.

Actually, the first court order demanded google and apple to remove vpn apps from their app stores, and the wording about fines is ambiguous about using vpns to access X or using them in general. The demand for vpn apps removal was rolled back, though.