Hi there,

I would only keep the content that is related to the business unless you are getting a lot of traffic from these articles that are not related to heating systems and gas cylinders.  Getting traffic it is always good to show Google that your site is interested enough to get visitors. If you decide to remove these blog posts, I would check if any of these irrelevant posts have any backlinks before you remove them. If they do have some links should try to redirect them to relevant pages that you would on your site or just keep them because of the high-quality links. It is a good idea to set up these deleted pages to 410 ( Page Gone)  so Google will remove from the index much faster.

Hi there,

I believe they think that your website is impersonating this website https://www.pardeehospitalfoundation.org 

To be honest they look quite similar.  Are those two businesses are own by the same company?

Ross

Hi there,

You should get more quality links if you want to improve your spam score.

Ross

Hi there,

Your spam score will not change if you disavowed links via Google Search Console.  Moz has no way of knowing that you disavowed any links. By disavowing these links you just telling Google to do not count them.

Ross

Hi there,

As you might know, do-follow links are passing more weight compare to no-follow, which means your DA can go down. I just do not think that Moz can explicitly say how they calculate their DA metric.

I hope this helps.