With Canon, AF specs based on the maximum aperture of the lens used are always applicable to PDAF (viewfinder) usage and are not applicable to CDAF (Live View) usage.

Although a lens with a wider aperture, as well as a well lit scene, make it easier for imaging sensor based autofocus to function quickly and accurately, in general most cameras can usually autofocus successfully with lenses having maximum apertures narrower than what their corresponding PDAF sensors can handle. This is mainly due to the differences in the way PDAF and CDAF work.

Many Canon cameras automatically disable, via firmware, the PDAF system when used with a lens that reports to the camera that it is limited to a maximum aperture smaller than f/5.6 (or f/8 for some top tier models).¹ Those same cameras do not automatically disable main imaging sensor based CDAF and will attempt to AF with f/8 lenses or even f/11 lens/teleconverter combinations. Sometimes they will even succeed.

¹ Even older models that don't automatically disable AF with an f/8 lens will struggle to be able to successfully AF at f/8 unless being used in very bright light on a high contrast target. This same models can often AF via sensor based CDAF with f/8 lenses.