Since @game-maker dragged me into this, I suppose I’ll have to offer my own 99¢. 
You make a brilliant observation @Rawalanche. I haven’t paid much attention to the learning portal (thou I prolly should) however.
It may be that it was the creators of those videos that categorized their work as being for indies, themselves. But if that is the case, there should be some review process to affirm that categorization.
Also, I think that categorizing a course as being for ‘indies’ would actually dissuade AAA, experienced devs, and Virtual Production people from viewing those courses.
And I can’t imagine that there are only 60 results for indies. There’s probably a lot of other categorization issues.
I’m just thankful that those courses are there if/when I do need them.
Game on!