Good question- but it is based on some assumptions. Therefore a categorical answer isn’t possible!
This is correct…
…as shown in this sutta quote:
"‘Everything exists’: That is one extreme. ‘Everything doesn’t exist’: That is a second extreme. Avoiding these two extremes, the Tathagata teaches the Dhamma via the middle. SN12.15
I would assert that the Buddha talks about the existence of experiences- for example- the experience of the five aggregates.
He says these experiences are connected to each other and have a cause and effect relationship (paticcasamuppada).
He doesn’t speculate much more about objective existence except:
when one sees the origination of the world as it actually is with right discernment, ‘non-existence’ with reference to the world does not occur to one. When one sees the cessation of the world as it actually is with right discernment, ‘existence’ with reference to the world does not occur to one. SN12.15
What follows on from there is does the experience of ‘mental’ phenomena arise from the experience of other mental phenomena. The answer is yes (contact phassa gives rise to feelings vedana for example).
“With contact as a requisite condition there is feeling”. MN148
Does the experience of matter give rise to the experience of consciousness? Again the answer is yes.
Dependent on the eye & forms there arises consciousness at the eye. Dependent on the ear & sounds there arises consciousness at the ear. MN148
Consciousness also gives rise to the experience of mental phenomena.
Mental phenomena can give rise to consciousness, as volitional formations giving rise to consciousness in the DO.
We see a real world and therefore we are attached to these nodes (or ‘jewels’) in the web of causality.