A person’s personal choice, such as what car to drive or what gender to present as, is not political, and not even remotely comparable.

It very well is though, but unrelated to the subject

Are human rights political, simply because they’re enshrined in government documents? If so, then I guess we can’t have any depictions life, liberty, or the pursuit of happiness either.

Human rights, subjects like freedom and stuff ARE political. The comic depicting some situations might not be even though they're feature, depending on the angle that is taken. The same comic in a situation where there's less freedom would not have been political had it not made reference to the debated topic or freedom.

Also, the 'political' stuff I'm talking about is more 'heated' subjects. Everything can be political, it's just a scale though, and I would say for this comic that the threshold has been exceeded.