First, bro, you’re absolutely right! 
Second, they say in the podcast that you could up your TSS by 5-10% per year. I was able to add a bit TSS to my mid volume plans and thus, I’m upping my TSS with 15% for the next season – and that already looks hard. But if you think about it, with this pace (+10-15% per year) I could handle the 50% increase from mid to high in for years (2022). And that would mean that I improve my recovery also.
Third, have you considered going slowly from mid to high volume with small increments in TSS from year to year? There might be something useful in the forum from coach Chad: Adjusting Your Training Plan