Yes, that is the manufacturers' listed weight, given on the Rab website. That looks like a decent price. There is a closable vent tube on the hidden side of the photograph which has a midge netting panel and allows one to take a peak at what's happening outside.
I just weighed my Rab Superlite Shelter 2 before posting at 255g, so there may be some variation, depending on the batch of fabric used.