If a website invites you to enter your Electrum seed, run away. There is a 99.9999% chance that this is a scam, even if they hide under the fact that "users can" download their source code from GitHub and run it locally.
The recently disclosed 'cycling attack' on Lightning only affects nodes that are forwarding payments. Payment forwarding with Electrum is experimental, and it is not exposed to users (only accessible through undocumented CLI options).