Yes, however, whether a wrongfully suspended member actually would report by that means would depend on how motivated they would be to use that e-mail at that point. I know that e-mailing is a simple means of communication, however often times people need to be motivated/interested enough to put in the perceived effort of reporting a problem, and the existence of obstacles (significant reduction in options to communicate) to add to being potentially wronged by a moderator (which members can view as being wronged by the website as a whole) can be demotivating and result in lost of interest.
The internet is huge, and in general people don't have to spend their free time and effort on any particular website. It can be said that it is the suspended member's problem that they may not be motivated/interested enough to put in the effort to report a wrongful suspension via the website's contact e-mail. However, it is the website's problem that such an issue with a moderator may remain unreported and unnoticed, as such a moderator might continue to misuse such power many times before someone files a report, and the wronged individuals that didn't report may not be interested in returning at that point.
With that said, what is the importance in moderators having the ability to suspend when they already have the ability to block and site admins can suspend? If there is an importance for a moderator to have this ability, is that important for all discourse installations or only important for certain kinds/sizes/etc installations and/or forum communities? If it isn't important for some installations, then perhaps this ability should be a setting that can be enabled/disabled (which I thought it might be hence my reason for creating this topic in the support category).