I think it is reasonably fair to test MySQL's default, recommended configuration which writes to disk frequently, particularly if the other configuration is not worth using.
If it is worth using, then the real question is what you give up by using MemSQL instead of MySQL in the alternate configuration.
If you mean to ding MemSQL on durability then you can ding MySQL on speed. If you aren't going to ding MemSQL on durability (because you are comparing it to less disk-intensive MySQL configs) then presenting a case for MySQL means you have to come up with something that you are giving up other than durability based on frequent disk writes.
So, what your video is saying, is that your speedboat is 80,000 faster than MySQL with an anchor attached. Seems like a fair comparison.