I’m biased but I think the marks are significant. It’s just too symmetrical.I read it in the latest ME report (the 32 pages one) both in Dr Wayne Ross's consultative report and in the ME's own review/observations of the autopsy's photos.
ETA: the ME Dr Simon noted the haemorrhage on the anterior neck muscles and small bruises on the skin (page 8) but she opined that these are not likely signs of strangulation (page 30). Dr Ross interpreted those as signs of strangulation.