Very unlikely since the WHO is and always has been, opposed to travel bans in response to outbreaks. Besides, per your source, South Africa actually announced the variant's existence.Connect the dots.
November 24, 2021:
South Africa tells Pfizer they don't want more shipments of the vaccine.
November 26, 2021:
WHO says that the Omicron variant was discovered in South Africa on November 24, 2021.
November 26, 2021 onwards:
Many countries rush to ban flights and immigration from South Africa.
Did Pfizer collaborate with the WHO to punish South Africa for refusing more shipments of the vaccine?
sources:
https://www.bloomberg.com/news/arti...j-j-pfizer-vaccine-delivery-delay-news24-says
https://www.who.int/news/item/26-11...ron-(b.1.1.529)-sars-cov-2-variant-of-concern
However, it does seem the variant will increase vaccine uptake. One of my daughters went to Publix yesterday for her booster appointment. She said the place was packed with walk-ins wanting to get their first shot.