No, there absolutely is a need to look at these issues critically instead of just relying on common psuedoscience.
Whaa?? Girls playing less video games and especially less RTS games is not an important issue. Not very many men watch The Bachelor...we don't need a formal investigation in to the matter.
And to directly address the content of the video I don't think that the learning curve or lack of teamwork has much to do with it. I don't know nearly as many girls irl that own gaming systems. The ones that do own consoles have them for entertaining guests. Mostly Nintendo games that are great for playing on TV when friends are over (eg. Mario Kart or Just Dance), not so much for their personal entertainment. Only one girl I know could be considered a "gamer" and she likes story driven games, not so much competitive multiplayer. So when you consider that most girls aren't in to competitive games period, it shouldn't come as a surprise that very few of them are in to the niche subcategory of RTS games that require investing significantly more money to get a gaming PC.
Generally speaking girls are less competitive and/or less inclined to like cognitive activities, which is why there aren't very many girls at university getting degrees in physics or engineering but rather education or biology. The ones that are more competitive typically invest all their competitive drive in sports. How many guys that are in to athletics also like to game? A lot of them. Girls that are in to sports play very little if any video games.