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You are talking about a vulnerability that was fixed with the release of Electrum version 4.2.2. The person who lost their coins was using Electrum version 4.3.2., so that issue would have been fixed a long time ago. Julerz12 must have done something else that resulted in someone stealing his money.
that wouldn't deduct it as an attack vector.
He could have used the vulnerable versions prior to downloading 4.3.2 in December, used a malicious URI that lead to a compromised PC.
That's one directly related to Electrum; But like I said, it's a hot wallet, so there's a lot of other possible scenario.