MAy I add another thought that is from left field. The referee showed the GK the yellow card twice! Remembering referees have previously been sanctioned for this.
Please discuss........
Watched again - I think he’s reached for the card straight away, then used that same hand to call the GK over (so you see a flash of card). You’re right though, others have been punished before, although never understand why the authorities get so concerned over such things, unless it actually causes confusion on the day.
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I think he does actually show the card twice. Firstly to prevent any incitement from the opposition for a red and corresponding counter confrontations from his team and secondly at the end of his formal cautioning process. So what?