“Renowned expert”? You’d want that name so you can look up relevant research but considering scales, I’d suggest nonsense. Think about eruptions. The energy levels are insane. There’s a temperature drop over time within rocks around geothermal wells (am no expert here) but the areal extent is not big enough probably to truly have an effect at caldera scale.
Geothermal energy is great and will grow substantially but I’d suggest reading technical papers because the more money flows in, the more bullshit will flow out