There is currently no way to prevent the appearance of this message through legitimate Electrum wallet so every warning is welcome. But the very fact that vulnerability still exists makes this wallet very risky for any inexperienced user. We can talk about how is important to always check files before installation, or to never download wallets from untrusted source - people simply do not pay attention to such things.

I'm not sure if it's technically possible that Electrum use this exploit in a way to show warning message to users, but before any transaction is initiated?