I am not sure what the role of Electrum is here, other than he used it?
I shared the CoinDesk article without reading it closely. The Block did a better job describing the issue:
Using Google Translate:
The police tracked down the man after stolen bitcoins from a rogue software update of Electrum wallet ended up with him.
Likely this problem. Older releases of Electrum (prior to v4.0) permitted a message to be displayed by the back-end Electrum server.
When this happens, the attackers instruct the server to show a popup on the user's screen, instructing the user to access an URL and download and install an Electrum wallet app update.
Bitcoin wallet update trick has netted criminals more than $22 million https://www.zdnet.com/article/bitcoin-wallet-trick-has-netted-criminals-more-than-22-million/
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