Not regarding omicron, but SARS viruses have escaped the lab numerous times in the past… even killing people. It’s not like the lab-leak hypothesis is the whackiest idea, some might even say it has a “strong prior”.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC416634/

https://www.who.int/bulletin/volumes/82/6/news.pdf?ua=1