i just read your link and it says this, which is confusing in the sense that this entire discussion is premised on the idea that Electrum is connecting to ONE potentially malicious server.  which is it?:

This is because normally Electrum connects to a few different servers and downloads block headers and checks that they match. This prevents / makes it more difficult for Rogue servers to send you bad information.


edit:  seems to me one should avoid setting the network server to a specific Electrum node but instead leave it on automatic to hopefully connect to multiple servers for your addy balances (assuming you aren't going to use a personal server or want to use a VPN instead).