I just had a lecture from someone who has been a senior scientist (and has completed a PhD, post-doc) at a hospital for already 15 years. So I'm assuming this person is experienced in giving talks in English. However, almost one out of three words was completely unintelligible because of a very strong Spanish accent where every word gets morphed into a Spanish-English hybrid word.
I spoke to two people after the lecture and they both said they couldn't follow along because of the strong accent. The questions after the talk were also not about the lecture but about the speaker's field the speaker was in in general. My impression is that the talk was a waste of time for the two dozen people present.
Now I wonder if the speaker is aware of this problem, my guess is no and as such I feel the need to bring this to the speaker's attention. If it was me I'd very much like to know that I have a problem communicating because I feel like a lack of communication skills can be a very serious barrier to being a good scientist but I don't know if she feels the same way.
My plan is to use an anonymous email address to send this feedback, sandwiched between two compliments to avoid coming off as a negative person.