Ugh…I don’t know if Max Tegmark is clueless when it comes to consciousness but at least the author who tried to describe his work is.
By and large it’s a good of rule of thumb to not trust a physicist on matters of consciousness.
Or a chemist, a biologist or most neuroscientists for that matter!
Two fundamental concepts someone must get before any of their ideas about consciousness should be taken seriously:
1) Subject-Object irreducibility
2) Emergence & Complex Systems
Oh and if they haven’t stabilized non-dual awareness in their own consciousness through extensive meditative practice all of their insights are probably contaminated with observer bias.
But if they’ve met those 3 conditions and as a bonus identify as a mystic, well then maybe you should listen to what they have to say.