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Yes it's quite an ok basis for the scientific method, but op was referring to objective truth. Shared subjectivity might be the best approximation, however it's no basis for objective ontology
How can an IR thermometer have a shared subjectivity with me?
How can you be sure it's not a Cartesian ghost trying to fill your senses into seeing one?
If you think there is a ghost it is up to you to provide evidence for it. And after you do that please explain how your ghost interacts with the real world in a perfectly consistent manner.
Remember it is always up to the person claiming something exists to advance evidence
real world
Ontology is about how we would objectively prove there is such a thing as the real world. There is a reason in science we're not talking about truth finding, but falsification.
Basically we can only come up with theories and try to disprove them. Objectively proving existence is an unsolved problem.
But that's a tldr of the entire history of philosophy, there's plenty of there to explore.
We got it backwards from the beginning. It is all these weird brain in the jar arguments that need to prove themselves not the physical world that does.