Your edit looks correct to me, and rejecting it was indeed inappropriate.
In addition to the edit being appropriate, there was a good edit reason to put it into context and ensure that it wouldn't be interpreted as vandalism. As others have said, the revision note could have been better, I agree, but what was there is, in my eyes, good enough that it really is the fault of the reviewer if they reject such an edit.
That said, people often review quickly and don't look at reviews in as much depth as they should. While the edit should have been approved, it's at least understandable that some reviewers would be inclined to reject it at first glance, so I'm not particularly surprised that it's rejected, even though it shouldn't be.
Now I believe my suggestions will be weighted down by the system and I will be in some kind of a grey list for introducing so called "spam".
If enough of your edits are rejected then you will be banned form suggesting edits for a week. It takes like 20 or so rejections within a week, if memory serves.
Please, some kind of auditory for the suggested edits review queue with edits that are like this since it is not my first time some edit is rejected by some inappropriate reason.
There have been problems with reviewers throughout its entire history. People have been working to address the various problems throughout that time. Some things have helped, some have hurt, and some haven't changed much. If you have specific suggestions as to how to improve the queue, then by all means, propose them. Note that there have been a lot of discussions on the topic however, so try to look through past discussions on the topic to see if your idea has already been brought up, or is even already in place.
Also keep in mind that it's pretty hard to suggest improvements to the queue if you haven't ever actually used it, merely been on the side suggesting edits. If you really would like to improve it you're probably best off waiting until you have enough rep to use it, and then using it for some time (a few weeks at least) before you're familiar enough with it's problems to knowledgeably suggest improvements.
That that suggested edit isn't counted in my reject reasons. Is not deserved and the system could deny me doing perfectly valid edits in the future.
If you end up being edit banned then you can petition to have it looked into. If you don't end up getting enough rejections to be banned before the rejections are old enough to not count then nobody is hurt, and it's really not worth mod intervention. If you get banned, and would like to dispute some of the edits, then you can contact the moderation team and they might intervene.
Remind reviewers, somehow, such as a big announcement in the queue that removing answers from the questions is perfectly valid edit. Include it somewhere in the FAQ, or remit users to seeing the "Queues best practice"; I don't know how this could be accomplished.
Honestly, I just don't see enough of these types of edits to warrant such behavior. There are other types of edits that are made much more often that have a higher error rate.