5V/2.5A Powered Hub OK for Twister after firmware has been updated?
I see a number of warnings against connecting the Twister to a usb hub, so I’ve connected directly for the firmware update.
Now that I’m ready to use as normal, is it ok to connect via this powered hub?:
(The powered version, with the 5V/2.5A adapter)
You can see this kind of warnings only if you are trying to update the firmware and it is strongly advised not to plug Twister in via USB HUB. Once you’ve updated the firmware you are free to use any USB HUB as long as it is a powered one. The unit you linked will do just fine 
Also make sure to reset your Twister to factory settings to complete the firmware update process.