you didnt answer my question directly. So is the servers (ALL) are safe to use now?
As long as you're using the latest version of Electrum (3.3.4), you shouldn't be exposed to any kind of error messages sent by the server, and that would make the servers safe, yes.
Specifically, you're only safe from phishing attack. Electrum user still vulnerable from sybil attack where Electrum server intentionally don't broadcast transaction from user or won't give user list of received transaction.
A bit off-topic, you can check list of known Electrum server at
https://uasf.saltylemon.org/electrum and
https://1209k.com/bitcoin-eye/ele.php