That's not rufibarbis. Formica rufa group is correct. If you have trouble to tell the difference, look at the size of the eyes compared to the rest of the head, Serviformica have larger eyes in relation to the head than Formica s. str.
But there's no mound, no flight this month, no nothing that would indicate they are rufa-group. They're nest looks like the most stereotypical F. rufibarbis nest there is. I will get more photos though. ( Also, I was told you could ID whetever they were rufa or not is by the length of maximillary palps, is that true? )