It depends. It is not safe to assume that jack stands/axle stands are rated one way or another in all cases. There are cases where the weight rating is for the pair, such as these Craftsman jack stands or these Pittsburgh jack stands.
Alternatively, some jack stand sets are rated per-stand, like these Duralast ones.
There are a few ways to check. As a general rule, cheaper stands tend to advertise the capacity of the pair. For the Craftsman stands, the only place the rating is mentioned is in the sticker on the stands, which you can see in the product image. For the Duralast stands, there are a couple of indicators: the warranted capacity is "1 to 2.99 ton," indicating the pair has a higher capacity than 2 tons, and there's a line where the description explicitly says "Jack Stand Weight Capacity Per Stand (tons): 2."
For yours, there's no clear indication, other than "CanadianTireTeam" answered a question on the product page asking essentially what you're asking here with, "...the support capacity of each stand is 2-ton (for a total of 4 tons). I apologize for the potential confusion; however, the rated capacity (per stand) is detailed on the packaging and stands, as well as in the manual."