Clearly, that table is incorrect. For a better idea, check out the bottom right table.
[Figure, Stress testing ECG and Charts. Contributed by Viliane Vilcant] - StatPearls - NCBI Bookshelf
This is the test that PADI is referring to. It seems like they are referring to completion of level 4 (12 minutes) to be adequate for diving. There's a VO2max conversion formula based on time and METS on this particular test. Using this formula, a successful completion of 12 minutes (all of level 4 at 13 METS) predicts a VO2max of between 42-43.
Athletically speaking, this would be a fair value for a male 13-19, good for 20-29, good for 30-39, good for 40-49, excellent for 50-59, and excellent for 60+. This would be superior (beyond excellent) for all female age groups. Not a lot of people would qualify for diving under PADI guidelines if they had to be evaluated seriously by a physician according to these stated standards.
Most cardiac protocols are happy with 6-9 minutes (level 2-3), and the medical literature has 10 METS (level 3) as a breakpoint for lower cardiac risk compared to general population. Using the same VO2max formula yields a VO2max of around 30 to predict completion of level 3 (9 minutes).
Athletically speaking, this would be a very poor value for a male 13-19, very poor for 20-29, very poor for 30-39, very poor for 40-49, poor for 50-59, and fair for 60+. For females, this would be poor for 13-19, fair for 20-29, fair for 30-39, good for 40-49, good for 50-59, and good for 60+. But this is a medical standard used to predict cardiac risk for normal daily activities, not scuba diving.
I know what my VO2max is roughly via other methods, so I'm going to give this a try at the treadmill sometime soon. I predict that I will be able to make at least 12 minutes, but not much more before exhaustion.