IMO, from a business standpoint not even Efest would be dumb enough to overstate the load ratings of a battery that much, while I do agree that the battery shape does actually appear almost identical without actual information related to the battery I simply refuse to believe that Efest would not only overstate the rating by that much but ALSO change the chemistry to IMR and label it as such.
Even if they were going to use a Panasonic Cell it would make more sense to use the NCR18650A which is rated at 3100mah, not 3000mah as the NCR18650BE cell you posted is. The NCR18650A is still only rated for a max of 2C, which is only 6Amps so it would make little sense for Efest to put that battery in a wrapper labeled 20A AND IMR to boot. This is honestly all speculation, if I'm able to get my hands on some of the 3100mah Purple Efests locally from a source I trust I'll rip the wrapper off and see what's going on underneath, which still may answer nothing at all.
This^^^^^
Somebody has something to gain and somebody will lose big when the litigation begins. Be it from personal injury or by false claims of fraudulent advertising.

If it wasn't for Dampfukkus, no one would have known the truth about these batteries.