I wonder if Apple views the "iPod" branding as being more associated with gaming and consumption and therefore less important from a security standpoint. I don't think I necessarily would agree with such a stance when the exact same hardware can carry sensitive stuff like a password manager, banking and medical apps, and so-on. But I imagine their telemetry showed that that overwhelmingly wasn't the case, so it was easy not to prioritize it.
No, it's more that Apple has always released iPod with older chips, and in this case it also decided to discontinue that product line, which meant that they dropped software support for it relatively soon.
I wonder if Apple views the "iPod" branding as being more associated with gaming and consumption and therefore less important from a security standpoint. I don't think I necessarily would agree with such a stance when the exact same hardware can carry sensitive stuff like a password manager, banking and medical apps, and so-on. But I imagine their telemetry showed that that overwhelmingly wasn't the case, so it was easy not to prioritize it.