What could have changed?

Here's my thinking.  If it were an official agreement or buyout of some sort that is coming down the pipe I doubt we would see massive buying in advance as the big buyer would be easily identified and would soon be caught acting on non-public info.  We're at 9 million traded and growing so far today.  Its pretty brazen almost hostile buying.  So there may be no "agreement" announcement coming soon or the outlandish buying would be highly suspect.

The big buyer continued to buy at seemingly the same or greater pace after the publication of the  CIRO-requested NR.  So again, doubtful the buyer has some sort of advance knowledge of a material event.  And CUU is now on the regulator's radar, but the big buyer just keeps on chomping.

What I know is that we have a very deep-pocketed big buyer who has no problem paying up for shares and is doing so with no new imminent material information.  So what's the hurry?   That leaves me to believe that this buying may be from a soon-to-be announced suitor or bidder for the entire company.

Pure speculation.   This could be just as easily Ernesto and he hasn't filed to Sedar yet.