They report errors that aren't errors to get you to upgrade
I used to find its audit of my website useful... but now it is just lies to get you to pay for a subscription. When I see the results of its audit I get stressed out about the website errors it tells me I have only to find out after checking the information they provided that its results are either wrong or they won't give me the specifics of the errors (so that I can investigate it) because it wants me to upgrade to a paid subscription which is a ludicrous amount of money they want from a small business. If you want accurate information, I do not recommend using the tools/services/audit on the Ahrefs website.