The word "hypo" is not very well defined....
Someone who is on insulin who gets a 'hypo' is likely to find that their BG keeps going down until they eat carbs, or are dead, regardless of how much rest they take etc. Somone who is just on Metformin many feel weak and unwell due to their BG dropping, but their BG will recover if all they do is sit in a warm room.
When marathon running's ‘bonk’ or ‘hits the wall’ it due to their BG dropping, yet we don’t call it a 'hypo' because 99.9% of the time they recover just by stopping running...... The feeling is just as real, regardless of what it is called.