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Wasn't one of the main selling points of WhatsApp back in the day that it ran on basically anything?

Might be one of BlackBerry's newer Android phones.

Why wouldn't you be able to?

BB used to run a custom QNX-based OS, not Android.

Whatsapp used to work on all sorts of crap. I'd not be surprised if they ran on pre-android BBs

WhatApp ran on Nokia's S60 platform, which is for feature-phones. Making a QNX version was probably much less of challenge.

You mean S40. S60 was Symbian, the smartphone platform.

Whatsapp was available on Symbian untill 2016, and they will support Gingerbread until 2020

It is Android. So yes.