The title is a little sensationalist. While the majority of wallets do only have SPV security, and such wallets were vulnerable to double spending during the recent fork event. The fork is over, so the wallets are no more vulnerable now than they were before (this vulnerability is not new).

I hope this incident has convinced other miners that the ~1% profit boost from "SPV Mining" is not worth the fork risk that it enables, although apparently one of the pools (Discus Fish aka F2Pool) has already been warned against SPV Mining in the past. Let's hope that coins lost through this fork event is the sterner warning they needed.