Only keywords in video description on YT = spammy?

Hey.

Building a mass upload tool here. Just wondering, if I do nothing but repeat the keywords, without any proper grammar, in the description field, would that be regarded as spammy? Example description for a movie clip: Nicole Kidman, Ewan MacGregor, Moulin Rouge

The keywords are all on topic, and I am not keyword stuffing or anything. The options are that YTs Bayesian filters might analyse the description and find that it lacks complete sentences and grammar, or that it simply does not matter.

That's perfectly fine for a movie clip. Look at legit trailers on youtube and you'll notice there descriptions and tags are borderline spam, youtube doesn't care.