This is more of a preventative treatment, so not sure if this is sufficient or if you were suggesting to just do the full fumigation, chemical and heat treatment on the entire building? 

Am I on the right path using this software or is it unnecessary for a newbie like me?

You need to avoid as many unnecessary expenses as possible.  

I am slowly accumulating a savings that would be used to buy my first investment in cash as I have very little tolerance for unnecessary debt.

These inspections help prevent that.

I imagine this is probably to prevent section 8 discrimination, but it may also prevent the type of screening you're talking about too.

Also, as long as you didn't prevent the buyer from doing inspections before you closed you should be good.  

Sounds like with the city opening up she has no legal grounds to prevent you from entering the property. 

It would be different if the furnace was newer or there was a severe hardship preventing it from being changed. 

Here is a link.https://www.fanniemae.com/portal/media/corporate-news/2020/covid-payment-deferral-7018.htmlThis way you prevented the seller from completely losing everything and you just got a good deal on the property while being protected.