Yep, he pretty much nailed it. But there are some discrepancies in the general rules here and there with different drugs.
For instance people lose deca gains because they're shutdown so hard/long. So with hard shutdown can come loss of gains, but it really depends on the person.
Tren shuts you down hard as well, but for many people it gives solid keepable gains. This can be attributed to its anti-cortisol properties.
With d-bol, deca, test, and anadrol, much of the weight/size is from water retention, and when you drop all that water it gives the illusion of muscle loss.
Winny, primo, EQ, and var are known for solid gains because they don't cause bloat and aren't overly suppressive.