Deactivate the adjustment layers before sampling a color. The sampled color includes the effect of all adjustments. If you paint with that color on the parent layer, adjustments will be applied again.
Update. As it turn out, the one finger drag as in the video tutorial doesn’t work, because I have “Touch for gesture only” enabled.
This means that I can zoom, scroll etc... but the one finger drag is disabled, hence I cannot import pictures.
(Note, that I wasn’t using the stylus.)
So problem solved, if you enable “Touch for gesture only”, you can only import/place pictures with the stylus, and not as is demonstrated in the video tutorial.
Leaving this issue there since this is a bit confusing, and in case this helps someone.