What happened 60,000 years before the period under didcussion is moot. Do you have any idea how long 60,000 years is? The entirety of our known civilization only goes back a mere 8,000 years.
Whatever genes existed in the pre-Toba population which do not exist now is unknown. Those putative missing genes are just that: speculative. They make no difference to human evolution. Moot.
And 10,000 survivors is a rather high number, the actual number may be only 2,000. The Late Pleistocene was a rough time for humanity.
“They make no difference to human evolution. Moot.”
Perhaps we’re quibbling over the definition of the word “moot.”
A dieback in the human population to 10,000, or 2,000, cannot possibly be irrelevant to human evolution.