Does iPhone 15 Pro purchased in Hong Kong support eSIM?

Not if it was originally sold there or in the Chinese mainland.

(262901)

As stated above, not if it was originally sold there.

It's also worth noting that the iPhone 15 Pro was discontinued in September of 2024.

If you're buying one there now, you're buying a used device.

Or new old stock, still available here in UK at major resellers.