I didn't read his comment that way and I agree that prolonged cardio, sustained and focused breathing, and sweating out toxins over a longer period of time is more conducive to affecting a negative mood than aggressively knocking out high weight/low rep sets. With it comes, also, the added benefit of a repetitive "zone" where you can do some greaaaat thinking and get used to having your body functioning on a higher level. Energy begets more energy.
Thriptic, you didn't bring to the table any thought that isn't criticism... which is fine but you also don't back it up which is what you are criticising this fellow for.
FYI the above is my opinion.