Captivate WCAG 2.1 Reflow - urgent

Hi I'm deeply concerned that a Captivate breakpoint project setup will not be able to conform to the reflow requirement in WCAG 2.1 as the breakpoints are not triggered on zoom. As far as I understand there is also no way to reliably detect zoom with Javascript. This would be a major spanner in the works for our workflow. Can anyone confirm that this is a roadblocker for breakpoint setups?

I don't know the fluid box setup well enough to say if it's the same problem there, but any input on that would be good as well.

Thanks Jorgen