You shouldn’t make an effort to implement HCD or design thinking into a meeting, it should come natural.
Would you mind expanding on this 'natural' idea?
I've had one masters level course in HCD so far - an overview of the entire process. Based on the range of readings, the elements of 'design thinking' or HCD or whatever any company or agency wants to call it are basically the same, but emphasize one phase or another based on their specific expertise and where they want to play. e.g. Frog would probably be more on the execution/implementation and IDEO on the anthropology/frameworks. (just guessing here).
The one course I've had was populated with about 50% certificate students, who do something like 18 credits rather than the MS 48+ credits. I don't know what value the certificate would have in the marketplace although its feasible that a good range of skills and methodologies could be learned and applied.
Is it possible to do all online? I'd say 'yes, but' ... it would be truncated or somewhat amputated. You can't really do contextual inquiry on-line, except for perhaps a very limited range of subjects. Group meetings and brainstorming are better in-person. We had group projects and used Slack and G-Suite extensively for online collaboration, but they weren’t as fruitful or creative as the live sessions. Lectures and reading of course could be administered on-line, as could quizzes, but we didn't have any quizzes or tests.
To combine an esteemed college brand with the words "design thinking" in order to charge $xxxxx.xx for a 'certificate' of debatable market value seems like the cynical view but I'd agree with yo's take above, its the most likely reason why you see more advertising for these things.