That is not a fact. In fact, it's 100% incorrect.
Pop took over the Spurs on December 10, 1996. Here's a link to the Spurs' 2005-06 media guide that has year-by-year transactions. You can confirm the firing date on page 141.
On December 10, 1996, the Spurs played a game at Phoenix in which David Robinson participated. He played in the 5 games that followed that one:
12/12/96 @ Clippers
12/14/96 vs. Dallas
12/19/96 @ Houston
12/21/96 vs. Phoenix
and
12/23/96 vs. Miami
David played in 6 games that season, and all six were after December 10. So, to say that Popovich took over a team without David Robinson is simply not right. The team that Popovich took over HAD David Robinson while the team that Bob Hill coached that season did not.
The remainder of your letter is pretty accurate, but that bit bothered me.

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