Hey JB,
I would recommend spending as much time as you can up at that 130bpm heart rate while you seek to improve the Aerobic Threshold, particularly if you can do so at a low perceived effort. This would include the recovery sessions in the Freeride plan, though pay heed to how your body feels on those days and lower the effort if you’re quite tired and/or sore.
When you get to week 6 and the beginning of the muscular endurance work it becomes even more important to retain that aerobic workload so stick with using your AeT of 130bpm as your target HR. I would also suggest re-testing that AeT using a drift test on a treadmill every 4-5 weeks to check for improvements, as it will undoubtedly rise as you build up the volume.
Good luck,
Sam.