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The hard part, apart from obtaining the nuke, is getting IRB approval.

(the article notes that they did use historical seismic data on nuclear tests to probe what the core was up to in the 60s)

Russian seismologists made artificial earthquakes up to M6 with nukes in the 1950s and 1960s under its peaceful nukes program. These data remain some of highest quality seismic data ever recorded.

Sure, and our radiation sensors are delicate enough to tell exactly how many people get poisoned by the fallout!

An underground test will be the best source of data, so no fallout as such.

Indeed, the article mentions using data from nuclear tests. Presumably “we just need to wait” includes waiting for a nuke to detonate somewhere. It’s not the 1960s anymore. I don’t think setting off a nuke as an intervention for measuring the earth’s core is a very popular idea these days.