To me it does sound threatening from someone who is disgusted with him.Easy to know
Rogue in Aldecaldos Temperance ending.
"Good luck out there, Johnny. And never come back to Night City"
For me, it don't sound like a threat, more like "don't come back, no one will miss you here."
Right time :
Not the same as Panam, who she want to find this fu..ing coward to "rip V out of his head" no matter where he's hidding (if V romance Panam).
Also at the right time :
So I don't think Johnny ask help to Rogue for leave Night City and maybe he will be caught at the border by Militech (a bus should be controlled I think)
Or maybe he have a L.O.A card with a big attachment
The message coupled with the bus scene don't contain the slightest hint that he's going to be caught and flogged by Militech at the border. That ending is clearly Johnny leaves town. They simply don't account for V being allowed that same consideration because of how appallingly simple and rigid the ending design is.