I don’t believe this is very true, I believe
knowledge === knowledge, or at least
experience === knowledge. This all really depends on the certifications themselves. You could get the html design certificates, and then try to apply got front-end framework related full stack freelance jobs. In this case you would probably be lacking tons of experience, even if you have 1 cert.
Certifications are just pieces of paper saying you did X. Nothing more nothing less. You can probably get some job out there from someone freelancing with or without certs. Getting a cert doesn’t magically make you “freelancable”, it might make you slightly more marketable, but so or direct experience at the job at hand, or just good marketing skills in general.
So don’t get hung up on the gamification rewards of FCC, the real value is in the content, projects, and experience. If you grind your way through FCC and get certs honestly, you automatically gain experience which is the most important thing, not the cert at the end.