How to identify if a website is filled with video game contents for free? : SEO

Hi, if I go semrush.com and use free account there,

Under “SEO => Link Building => Backlink Analytics” menu,

If I type there a website address and then I see something like the following

I have no idea if any of them indicates that the website is about video games.

Even under “SEO => Competitive Research => Domain Overview”, I only see the followings after typing website address:

• Informational 61.9%

• Navigational 12.9%

• Commercial 12.3%

• Transactional 12.9%

… I also have no idea if any of above indicates that the website is about video gaming.

I really have no idea how to figure out if the website I want to make a backlink is about video game. Of course, I can simply check the website by browsing, but most website with high DA that provides quality backlink is filled with contents around multiple categories not just video games. So I don’t know what percentage of the website’s total content is about video game content. Thus I need to know deeply about how much they are related to video game prior to contacting for video back guest posting stuffs. How do you know it for free?