It doesn't matter if the icon is ever so slightly ambigious compared to other systems, the label text next to it removes any ambiguity and makes the message perfectly clear, as long as it is consistent within a product. To any newcomer to a new system, most icons don't make sense, so the text next to it is an invaluable hidden tutorial. OP didn't stop to see that the circled checkmarks look like clocks, so it just highly opinionated.