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Your second statement is almost correct and then fully wrong, followed by 100% correct. Let's go sentence by sentence.

people with brain function can't control their blood pressure

Sure you can! But only to a degree. If you've got access to a blood pressure cuff, try these things yourself: sitting, standing, while eating, holding your breath at the beginning, holding your breath at the end, holding your breath the entire time (legendary mode), while incredibly thirsty, after drinking water, while petting a dog, while getting bit by a dog (don't actually do this), or while watching a scary movie.

Even positive and negative emotions can alter your blood pressure. While these types of things can't cure someone with congenital heart disease, there are numerous anecdotes of people's health improving after leaving a stressful job.

You're correct, though, in terms of making sudden and significant changes to your BP requires more than just a positive thought and a new position. Sometimes you need some medication or substantial life changes to illicit real change. But to TranscendentalEmpire's point, your brain absolutely plays a role in regulating your blood pressure. If someone is completely brain dead, they have nothing to close the feedback loop that tells the body "whoa! Heart rate is going up, we're definitely fleeing from a predator! Increase blood pressure now, dammit!"

If they could we wouldn't need BP meds

This is like saying "if people could swim we wouldn't need boats." Some people could control their BP by consuming less salt or by not clogging their arteries with cholesterol but they'd rather continue impacting their health and just takes meds to deal with it. Just like how some people would rather be on a boat instead of in the water.

Some people are born with or naturally develop heart disease and need medication to deal with it. Just like how some people can't swim and need something to carry them across water.

Some people, like me, have made poor health choices and found out later in life that they have a congenital heart disease, and then they get a number of different medications including BP pills. This isn't that different than someone who can swim but fell into the water with their clothes on and are starting to get tired so they need a boat to rescue them.

Unless your name is Dwight or Dennis

Fact. This is 100% true.