another potential issue could be that the LED he's using is not dimmable
They are.
I received an answer from the official support team saying that there is a compatibility issue with Philips' warm glow feature.
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I'm using a Shelly dimmer 2 with neutral wire and no bypass and one Philips GU10 3.8w LED Warm glow.
As you can see in the video, the brightness increases linearly from 0% to 90%, it goes from 0lux to 320lux. Then from 90% to 91% it goes from 320lux to 830lux in 1 minute (sometimes less).
Also when lowering from 87% to 86% it goes from 790lux to 280lux in 10 seconds.