[QUESTION] Is fingerstyle string scratching a thing?

I found this video where a guy played “Dragon Roost Island” .
It looked like he was scratching the strings with his nails instead of strumming them. I tried to replicate this, but I’m not sure how. When I try to scratch upwards, my fingers seem to get stuck between the strings.
This is the only time I have ever seen anyone scratching the strings instead of strumming them. Does anyone know where I can find more resources about this? Or any tips on how I could play like this?
Could not find anything about it on Google yet. Maybe he is doing something else?

submitted by /u/PiratePengu1n
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