you are all things...in potential?

[Sagittarius]

Isn't any form of belief solipsism?

Nope. Solipsism requires either laziness or alarming self obsession, there is a reason it is a childish philosophy. You would be hard pressed to find a possible uglier or more bullshit philosophy.

Solipsism seems quite spot on to me, even if the ones who wrote it had a smaller and unrefined view of what the words could entail. Does fear of laziness and self-obsession come under the microscope ?

Have you met every solipsist to make that measured judgement that it requires either of those extremes to be defined as a solipsist. Are you sure that reaction to what you define as a solipsist isn't entirely of your own making ?