Just because it has an oil level sensor, doesn’t mean it warns you soon enough. Heard plenty of horror cases where the sensor triggering basically means that the engine is FUBAR.
Well, just top it up and hope, and maybe get an oil change soon-ish.
My 1.4 TSI shitbox has an oil level sensor that doesn’t trigger until the dipstick has been dry for a long time. Reading the dipstick is also a great experience, as the dipstick tube tends to hold oil and smear it onto the stick.
My car had extremely low oil usage until it didn’t and caught me not checking it one too many times. Dipstick was dry except for a tiny drop right at the very end. Found the most level spot I could and filled it up bit by bit (lots of bits…). Been driving as good as it ever was (read: like shit).
Just because the car’s ignition is on, doesn’t mean the engine is running. Especially in a hybrid like yours, the car’s computer manages starting/stopping of the engine. Since your car was stopped, the computer stopped the engine as it didn’t deem it necessary for it to be running.
As for the shop, they wouldn’t change the oil of an engine that’s running, that level of stupidity is quite rare. If the engine was running, it would be pretty darn obvious - it would spit oil back at them, among other things.