Okay the term "lactate threshold" probably just confuses the issue as it seems to get applied to both... but Maffetone is definitely referring to the lower (aerobic) threshold.
Your one-hour max test gives "functional threshold" which is upper (anaerobic) threshold more or less (output power level at one-hour pace is the key benchmark for many of the power-based bike training systems eg Coggan, Carmicheal, Friel).
Yes, that's exactly what he's saying.... long slow distance (and lots of it)