I watched a bit of the video. First thing I noticed was that it is dated 2015. A lot has changed since then, so much so that it is almost a different app 
. Secondly, the author isn’t using mask mode at all. He or she is using plain layers. I haven’t watched the rest as I am in the middle of something else ATM (but am still itching to help 
). Perhaps, the next step is to copy-paste the blended result into a mask. Sorry, I couldn’t be of better assistance.
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