It is possible though not recommended under any circumstances. As you said, the current would bypass the voltage regulator and this can damage other parts of the circuit. The board is not designed to be fed through this pin. Use only the designated input pin for this: VIN (voltage input range: 6V to 21V).
Is this germane to the Nano Every?
I am asking this because in this post (My maiden post on this forum) I was actually encouraged to feed power this way, although the responders were mostly referring to Uno and Mega boards. Using the onboard regulator was actually discouraged as it is not capable of delivering much power, and if it is fed by much more than +6v (such as +12v if such a supply were already being used for the project) then the power capacity drops significantly as it is a linear regulator, not allowing much available for even the outputs for the chip. (To be clear I was cautioned against connecting to USB while the board is powered this way, though someone suggested that other boards may have USB back-feed protection - eg, diode.)
So if I have a lot of peripherals that require regulated 5v, the onboard regulator will not be large enough to power them, thus I will need separate supplies, one 5v regulated for the peripherals, and another 6 or so volts to supply the Nano. Also, 6 or 7 volts is a power supply output configuration which is not very common, and as stated, going to the next common output configuation (12v or maybe 9v) lowers the capacity of the onboard regulator.
I'm not meaning to whine here, just stating the challenges I would be faced with if I am unable to power the Nano directly, and the discrepancy against what I've been told regarding the Uno and Mega.
Is it possible the Nano has a more robust voltage regulator, ie, PWM rather than linear?
I should be clear to say I was referring to powering the board with a regulated +5v supply, if that makes a difference.