I followed up with Vladimir Leshchenko at https://alflash.com.ua/index.html
He performed a remote diagnostics and immediately found the problem to be
a failed powertrain coolant pump.
In a previous post, https://www.myrav4ev.com/forum/viewtopic.php?t=2484
dfergenson mentioned he replaced his powertrain coolant pump with a Tesla
coolant pump he had purchased on eBay, part number 6007376-00-E.
While shopping on eBay for a used pump, I found what seemed to be a slight
discrepancy in the Tesla replacement part number.
After bringing up this discrepancy with him, he confirmed that the correct part number
should be 6007367-00-E.