I'm not actually sure whether this has been achieved successfully anywhere since either.
It has: Birth of a western lowland gorilla (Gorilla gorilla gorilla) following in vitro fertilization and embryo transfer - PubMed
However, bearing in mind this is a species that now breeds readily in captivity and many females are on contraception to prevent overcrowding in zoos, it’s less and less likely this sort of technology will be used in the future.
The chance of a female gorilla being of sufficient genetic value to warrant this treatment AND being unable to conceive naturally would be slim.