I am looking for external opinion about guestposting in low DR blogs

Dudes,
I am interested to know about your opinion.
I have posted a thread in a local SEO forum in my country about guest posting exchange.
And I have received the following inquiry:
- I can post in two blogs:
- the first has 72 keywords indexed according to Ubersuggest, 104 monthly traffic, 9 domain authority, 337 backlinks;
- the second has 111 keywords indexed according to Ubersuggest, 1152 monthly traffic, 12 domain authority, 39 backlinks;

My blog has 1190 keywords indexed according to Ubersuggest, 3017 monthly traffic, 26 domain authority, 86 backlinks;

Against the two guest posts, I must accept a guest post to a website that has 2028 keywords indexed according to Ubersuggest, 11 831 montly traffic, 26 domain authority, 66 758 backlinks.

I know that the proposed blogs are low-key pbns, in the Finance-Bussines niche (where some of my content is) with not to bad metrics. My questions is: what to do? I am also documenting the journey of my blog here, in Blackhatworld. And I have pointed that I have a low budget. I have been very conservative about link building so far.
What to do?

You mean like a link exchange? If the websites are related in any way that can get you a penalty

They have same owner.
I am unaware if the "footprints" of their creation will point to him.
He have used them to his big, money site.
Obviously, he is doing well with the website.