Yes, it is. It's the source of the data for the article you linked. That article sent me to that site.
It is the evidence your site offered as proof. But as you see, it doesn't support their claims. In fact, it rather handily refutes them. Perhaps the guy who wrote the article you cited, never bothered to look at the evidence. Here it is:
According to the most recent data published by the Government of Alberta, deaths from “unknown” causes became the leading killer in the province – claiming more lives than heart disease, diabetes, and strokes, COMBINED – in 2021. When compared to pre-pandemic data the total number of deaths without a known cause is a staggering 7x higher than it was in 2019.
Go to the first link and read what it says. This isn't news. CDC had been notified by state authorities and epidemiologists about the increase in long-hauler deaths quite a while ago.