Solipsism is the only actual know objectivity that we can know, yes. Everything else is a collaborative agreement with its foundational pillars rooted in human subjectivity. You cannot impartially observe when you are within the environment you are attempting to assess, solipsism allows us to realize that we can only believe in everything - yes. However the point of solipsism is to provide the most basic foundation to science - repeated faith in hypothesis and experimentation, we follow specific logistics and steps to ensure that the data we are attempting to observe and calculate can also be the least corrupted. This usually means leaving out our bias and letting go of what we want to happen, and instead accepting what ever actually happens. Solipsism is only meant to help us hold a fortitude against deceit, i.e others with their subjectivity, and we must move forward in building up what we can so that we can bring us further to The objective truth. Solipsism is the first step you must accept, but it is most definitely not the last.
