I propose a stratified view of knowing. "Level zero" is the checkpoint where a thought is directly present in lived experience, independent of whether it was generated internally or externally.
Also interesting around 09:36. He hints that parts of the scientific community tend to avoid this territory. Intuitively you'd think exploring unknowns should be fun – so why the reluctance?
Speculation: B. Kastrup sometimes frames this as a first-person / third-person divide with historical roots: modern science won its freedom by focusing on third-person, publicly measurable claims, while bracketting first-person and "ultimate" questions.
Not a literal written deal, but a cultural boundary that still bubbles up and shapes what feels legitimate to study – i.e., culture quietly sets the constraints on what counts as rational inquiry.