John uses wrist motion, from a slightly supinated arm position. Your arm position looks pretty much the same to me. So I’m not really seeing the “disadvantage” here.
With the arm position you have, you can choose to make a picking motion where only the downstroke escapes. That would be your “upward pickslanting” motion, or what we sometimes call a “2:00” wrist motion. This is what it looks like you are doing around the 20 second mark.
It’s also similar to what Andy James is doing in the thread about him today, which you can find here:
This is a good example of why I think we will eventually we’ll stop using the term “pickslanting” to describe motions. I think it’s probably clearer for most people to look at the motions they are making and understand exactly what they are doing, instead of worrying that they have “too much slant” or something, which is frankly never the way it worked. I know we’re responsible for this confusion so again I apologize - we’re learning to be clearer as we go here.