It's explained in the article that this is to solve one specific issue that Gambit Research had: in some parts of their code they need to take action with very

It's explained in the article that this is to solve one specific issue that Gambit Research had: in some parts of their code they need to take action with very low latencies (<10ms) and hence they can't wait for the GC. This way they manually execute the GC in other sections of the code were timing requirements are relaxed.