need explanation for "Does not meet contribution guidelines."

Let me throw something else at this. The show has "documentary" although I'm not sure that's what I would consider it, but the link you give has this for documentary:"The "Bowling for Columbine" rule: If the film is a documentary ..."

Does what you say apply if this is considered a documentary AND is also not (right or wrong) considered part of the TBBT series.

If what you say still holds, then all of these other credits need to be deleted as they are the identical situation.

And the only movie connection is "spoofs" which I don't think fits. But I'm not sure what is the correct one. This show played clips from the series. Spoofs says "the movie makes a joke reference to a previous title" but it wasn't all jokes. They were relevant clips of the 12 seasons of the show and not all were of humor.
I think "references" is more correct.

"Features" would be the usual connection type for clips.

I think the list of archive footage rules is meant to be prioritized so that the "movielink" rule trumps the later rules, but I agree it's not that clear.

There's also this note in another guide page:

"(archive footage) A cast member appears in some footage from an unidentified production, usually newsreel, behind-the-scenes, or home movies. This is helpful to explain the appearance of a person in a documentary released after their death. If the footage is from an identified production, then it should instead be described by a "featured in" movie link, and no cast/crew entry should be created for the new title."
https://help.imdb.com/article/contrib...

Got to say I'm confused, but likely the hour and the need to process a square peg into a circle hole.
The only thing I know for sure is that either there aren't enough actors credited or there are too many. lol.
I'll have to see if I still have it, but this show was I believe 99% clips from the series. There were a couple that I think might have been behind the scenes although I don't recall any in particular.

I'm willing to get this is why someone submitted Wil Wheaton as a trivia item. They likely tried to add him to cast and were declined, then tried to follow-up possibly and got not help, so it was easier then to just do a trivia item.

Either Wheaton is appropriate or all the other archive uncredited credits need to be deleted also.

And I don't use a spam filter and I've not gotten anything about it but I'll look again.

Lastly, can you at least answer the question whether the credits belong or not?

I see you've already been in contact with us via our messaging system; please continue to work with us there on this.

Why? The answer to the question Mike raises can be of interest to a lot of contributors. Shouldn't this information be shared?

And I looked and unless I'm missing it I don't have a reply from contact us. So there's either missing credits including the one I tried to add, or there are multiple bad credits because they are all alike. 
Maybe someone will clarify.

I'd truly like to know if the credits that exist are bad or why Will Wheaton as an example of just actor as there are others, cannot be added. If Wheaton is unacceptable, then so are multiple others unless someone has a good reason.
For the record, the show was only hosted by two actors and all others were from archive footage.
Please explain.