The issue has been fixed and it is no longer reproducible. The page loads as expected, with no issues encountered when loading the page or navigating the page, regardless if the Intervention is enabled or not:
Browser / Version: Firefox Nightly 99.0a1 (2015863755 -🦎99.0a1-20220216094238🦎)
Operating System: Samsung A51 (Android 11) -1080 × 2400 pixels 20:9 aspect ratio (~405 ppi density)
This is working because dom.netinfo.enabled was disabled in https://bugzilla.mozilla.org/show_bug.cgi?id=1637922, which made navigator.connection to be undefined (and the site was relying on for their logic). So indeed the intervention is no longer needed for chanel.com, but maybe we can reuse it for cases like https://bugzilla.mozilla.org/show_bug.cgi?id=1755852
FYI, I filed https://bugzilla.mozilla.org/show_bug.cgi?id=1756692 where this intervention can be reused to fix the site issue.
Patch shipping in Firefox 99 as part of the addon's v31 in bug 1752986.