The article is email-walled, and it's a terrible, unedited article full of superfluous sentences, redundant info, punctuation errors, etc. Just bad English.
The devops training site katacoda.com will be interesting to watch. They spin up and tear down _so_ many VMs, their cloud bill must be monstrous. Firecracker is much leaner, so they would save a lot of cycles by spinning up Firecracker over Kata.