I'm not saying COVID doesn't have long-term impacts in certain portions of the population, but this sentence is pretty important: "However, the findings are observational, and the authors cannot rule out the possibility that rates of diagnoses in general might have decreased indirectly because of the pandemic, particularly in people not admitted to hospital with covid-19."

It's really hard to draw meaningful conclusions when COVID has completely changed all kinds of factors in healthcare ranging from people being stuck at home and eating poorly to opting not to visit the doctor because of overburdened hospitals and fear of infection. I'd like to see some studies a year from now before forming a strong opinion.