I'm going to say Max is definitely growing slightly bigger than Felix but I don't think his cubing career is nowhere near over. He's still the holder of both 3x3 WR's and plenty more. He's very active in competitions and such.
Congrats! He set it a Cube for Cambodia 2018 on the Angstrom Gan Air SM. He said it was an X-cross, smooth F2L and an easy OLL and PLL skip. He also got another sub-5 in the avg but it was only a 6.29 avg.