Joking aside I'm always a bit...conflicted (?) about genderbender like this. It's been an interest and fantasy for a long time, yet I do not really count myself as trans or anything like it really. Makes me feel like I'm stepping on peoples toes by enjoying something for a more shallow reason.
It's fine to enjoy something even if you're not part of the target demographic or the group being portrayed- indeed, one of the ways global awareness about queer media and narratives spreads is via supportive allies. The LGBT movement was always based in solidarity, acceptance and inclusion, and in the hopes that those who weren't recognized or accepted by society could come together and acknowledge each other's stories. You can enjoy a lesbian story if you're straight, or a nonbinary story if you're trans, or a story about an asexual man in Russia if you're from Brazil.
The key is empathy and respect, and while certain people might certainly relate more to stories that portray their respective sexualities, that doesn't make anyone else's experience 'shallow'. Just make sure you don't end up like those weebs who read genderbender stuff for kinks and then treat actual trans folk like crap, because fetishization is pretty big issue with this genre. This also applies to a lot of authors that write genderbender, since they play the situation for jokes and end up reinforcing heteronormativity with tropes like 'turning into a girl will make you want to do guys, regardless of your original sexuality'. Thankfully, this one's a lot more wholesome, and I hope we get more content like this in the future. Enjoying something as great as this isn't shallow at all- it just means you've got good taste.