2 other developments support my theory 1 - Ryan Smith tweeted that purple
is and will always be part of the Jazz' brand identity. That contradicts the changes and leaks from over the prior year that pointed to a color scheme of black, yellow, and white. To wit, the block note in front of the arena was painted black before the season and remained that color up until the playoffs when it was painted gold.
2 - The block note was not reverted to black. Instead it has been re-painted to look the way it looked before it was painted black. It is navy blue (or maybe purple - I have some color blindness and it's often hard to distinguish shades in images), green, and yellow.