There is more to the story and one of the guys from Well There's Your Problem actually did a really good video on it.
Long story not so short:
Heemeyer ran a muffler shop in a building he bought for $42,000, this building originally was part of a concrete plant which was sold off a while before this. Some time later the original plant owners bought back most of the plant and wanted to get all of it back by buying his land for a pretty good price. He was hilariously unreasonable, Heemeyer wanted $250,000 for his piece of shit plot, couple days later concrete plant said sure we'll do that so he raised it to $375,000. Two months later the concrete plant comes up with $350,000, he counters with giving an actually on paper offer of $450,000 so that went nowhere and the concrete plant just bought another plot next to Heemeyer so he did the reasonable thing and went on with his life, right?
Of course not, he started a NIMBY campaign and lost it when support vanished after the company made a bunch of concessions and actually did something about their dust and noise polution. He then sued them to hold up the process, remember that one.
Heemeyer also had a bit of a sewage problem as in at this point the concrete truck drum his toilet emptied into was full and he was pumping his literal shit into a irrigation ditch to make space. About a decade earlier he did the paperwork for a sewer hookup, when he was told he would have to pay for this himself even though he was now part of the on paper sewer district, he didn't actually get hooked up. This caught up to him now when the town got complaints from the absolute shit stench he was creating since this ditch only flowed when it rained. The sewer district only now realized that he wasn't hooked up and forced him to stop shitting into a concrete drum. He asked for leniency and was granted a lot more time to solve this problem. One of the things which got him even more angry was that a sewer board member was the co-owner of a local digging company, he saw this as a plot to get him to pay the digging company for making the sewer trench.
This is when he got an offer from the concrete plant. Drop the quite hopeless lawsuit and they would let him up hook up to the sewer line they would have to make for their new building and would even pay for extra work to also connect his building. Heemeyer hung up on them. He later lost the lawsuit and with it the offer for a free sewer line.
This is when he sold the shop and all his tools and he got around $400,000. When the dozer failed to sell though he saw it as a sign from god that it was time to get revenge aaaand the rest is history.
So along with what you said, guy was also small business tyrant who didn't get his way because he was an asshole to the point of shooting himself in the foot just to spite others, repeatedly.
Oh hey, I also run Blades in the Dark for my group.
Blades and its base setting is great with this, Doskvol pretty much has class conflict and imperialism built into setting to the point it's hard not to use it in some form. In the current iteration of my game I'm laying it on a bit thick playing in a homebrewed Tycherosi city with among other things demonic overlords living it up big in times of food shortages and imperial meddling.