How did yoy manage to feed 2 sata 2,5" drives on the Pi4B?
Because he's using SSDs which have a lower power consumption.
my drives are WD MyPassport Ultra 5TB 2,5".
Those drives are HDD.
And NO, you won't be able to power them together on the Pi USB ports alone.
Either have a proper USB box with external power or use the same setup as he did, with SSDs.
Even so, I (me and personal choice) wouldn't trust a setup with Pi only power unless there's a UPS for redundancy on power failures.
SBCs or the SSDs don't "like" power failures.