I assume they are attacking the Electrum's servers so their malicious ones can be the only ones working. The user will try servers/close and reopen Electrum until one synchronizes (the bad one), which will give him the “please update” fake message.
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Many people are still on older versions.
If this is true and there is a profit from these attacks do not expect to disappear soon.
There will be tours that will continue from time to time until profits reach zero.
Also, do not rule out attacks because of trying to distorting electurm wallet reputation for another new rising wallets. <I do not expect that is the reason this time.>