Yes, the first version came with a single color and red was one of them. The second version has RGB aux, but can be configured to red, so you’ll get the same result.

but they all flash the auxiliary after they turn off

That is called “post-off voltage display” and it can be turned off. Make sure to have Advanced UI active (10H). Enter batt-check mode (3C), enter the battery config menu via 7H and release the button after the second flash. Now you can click how many seconds post-off voltage should be shown or do nothing to disable it.