alt Hacker Newscareful: in many programming contexts parallelism and concurrency are exclusive concepts, and sometimes under the umbrella of async, which is a term that applies to a different domain.
in other contexts these words don't describe disjoint sets of things so it's important to clearly define your terms when talking about software.
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yes, some people swap the meaning of concurrency and asynchrony. But, almost all implementations of async use main event loops, global interpreter lock, co-routines etc. and thus at the end of the day only do one thing at a time.
Therefore I think this definition makes the most sense in practical terms. Defining concurrency as the superset is a useful construct because you have to deal with the same issues in both cases. And differentiating asynchrony and parallelism makes sense because it changes the trade-off of latency and energy consumption (if the bandwidth is fixed).
Yeah concurrency is not parallelism. https://go.dev/blog/waza-talk