TM/ad text question of the day

The shorthand rule in the US is that if you don't use the competitor's trademark in your ad text, you're fine. What if you do? The below ad (which you get by searching "broken Garmin mounts") isn't an explicit statement, but I'd argue that anyone whose ad title is "broken Garmin mounts" is probably not Garmin, which is likely to take a more circumspect approach to what appears to be a design vulnerability.