My first suggestion would be to just follow a Jack Daniels plan. If successful with it, maybe they can call themselves 'JD Elite'. :-)
However, such an idea does require further investigation; maybe they are attempting to follow Daniels? Because in Jack Daniels' definition of "Intervals", he says, "Total running of an Interval session should not exceed the lesser of 8% of weekly mileage and 10k (whichever comes first)."* I'm taken aback by that latter point, because "Intervals", per the Jack Daniels Calculator (JDC), are roughly going to be prescribed around 5k pace at these guy's VDOT level. So such a session would consist of twice the volume of their all-out 5k race pace. I'm not a pro, but I think that is going to be a very hard and difficult session. Trying to do them even faster than that makes no sense (impossible?). So if they are attempting to follow Daniels, and they are trying to run their Intervals at 3k pace (or even faster), then they are woefully missing the target.
*Source of Daniels' definition of VO2max 'Intervals':
https://vdoto2.com/LearnMore/TrainingDefinitions
Let's take, as an example, Andrew Hunter, assuming he currently is in ~3:37 shape (at sea level) for the 1500m, having a 78.6 VDOT per the JDC. Per the JDC, his 'Interval' paces should be 4:22/mile (2:43/km). (Note, one with a 78.6 VDOT runs a 5k at 2:42/km, per the Calculator.). The JDC provides adjustments for altitude. For example if the 1k VO2max Interval session is conducted at 7000ft, the 1k's should be run at 2:51/km (instead of 2:43/km).