Cook it up well done and see it the spots get smaller or go away. To see if it's just fat spots.
Eat it then and let us know later if it makes you sick.
based on the photo and your description, if it looks good and smells good otherwise, I'd eat it. I'd ask the butcher about it, too. I've butchered and vacuum packaged a lot of venison, but I've never seen anything like that.
. A survey of 208 white-tailed deer from Ontario, Texas and Wisconsin showed 80% to be infected. Four of 16 white-tailed deer were found infected in a small survey in Michigan.
Domestic animals that are heavily infected may be condemned as unfit for human consumption. Ducks and rabbits are the species of Michigan wildlife that hunters and wildlife biologists are most likely to find infected with Sarcocystis. At this time so much is unknown about Sarcocystis that it is recommended that infected meat from ducks and rabbits not be used for human consumption or fed to cats and dogs
On one hand they say almost every deer has it. On the other they say not to eat it. Lol.