Apparently yes. (Not on the same machine, but I just checked on my work notebook where I have uBlock rather than uMatrix, and cdn.ampproject.org is let through.)
Ah interesting. Thanks for bringing this up. I use uBlock but didn't have any issues rendering it. Since I don't really care about the SEO/Google hosting it it might make sense to just link to my own locally hosted version to avoid the adblocking block.