Seems so. So I installed a monitor program. And indeed it warms up, goes above the temperature I set. I get a black screen for a moment, then it continues.
But at times, without the monitor warning, the system goes in power down.
Then with KB4465065 installed, the monitor does not report a lot of warming up. But the system stops increased enormously. Within 15 minutes the system stops and powers down (without any warning).
Before that (KB4465065) I could some work, keeping an fan directed at the mini-pc. At a certain moment the dark screens would appear, about 3 to 5 times and then I would get the power down.
I ran the SSU. Tried to include in here, but apparently the size is too much.