I'd agree that we'd want to be positive to all fields touched by amateur radio – for example, antenna design.
However, this site is not https://electronics.stackexchange.com, and shouldn't strive to be – that would mean it'd lose its focus on amateur radio.
So, my personal guidance has always been:
Can I view this question as tangential to amateur radio?
So, for example:
How can collision avoidance in an ad-hoc network work?
would be on-topic, because it can be applied to ham radio, whereas
How does collision control in {commercial standard} work?
would be off-topic, because it's not-applicable to ham radio, and OP would actually be better off at our sister sites.
Now, for antenna questions, it's a bit hard, since there's amateur bands all over the spectrum and any antenna architecture can hence be used in an amateur context, at least theoretically.
Regarding the specific post in question: that's not really an antenna, it's the primary coil of a transformer for wireless charging, which has no application in amateur radio, so it's IMHO off-topic.
I think Glenn's answer shows that very well: it's a well-written electrical engineering question with no relationship to amateur radio.