It is a balance of forces that keeps us in orbit. Changing the balance is what would change the trajectory.

We don't actually know what the change in reflectance would be.
We don't even know what all the forces involved actually are, but those of us with experience of orbital trajectories know that it is next to impossible to put a satellite into stable orbit in such a way as it never needs to controlled by use of onboard fuel again, to maintain a stable enough orbit for practical communications, for more than a few revolutions.
Why has our planet done that for billions of revolutions?
Do you know the answer to that? Of course not.
Yet if you had enough capital, not knowing these things and many more which affect it systemically, you might put it on GeoEngineering, making it happen.
So there are many people with the capability to potentially destroy Earth, because they have the capital to do so, and yet without the knowledge to truly know the risks..
How long will it be before that happens?
Did you know to make this conideration, and many more, to weigh up the safety case?
Obviously not, but still all you need to make it happen anyway is anyone with the money or power to make it happen, and there are many more investors with your unfounded belief.
Also there is the fact that the sun is the natural energy source of all of nature.
All we need to do to work with it is monetise its energy. I've spent five years and counting, unpaid, at my own expense, to explain how we can do that, believing for life that we must do it.
Evidently you believe differently, but I challenge you to do the work necessary to prove your faith.
It isn't enough to say that you don't think there is a risk. No risk is acceptable when the outcome of the risk is pretty much instant death of all life on Earth.
Btw, how was this "1.5cm" movement measured, in the article of the financial publication of Forbes?
I doubt very much the validity of such a measurement. The volume and radius of the sun itself probaly varies by much more.
Would this be the first time ever that Forbes published something unprovable to sell a very bad idea to gullible investors?