Before last year, I might've thought it was okay to throw out silly things as advertisements.
Do we know if it was the worker who presented it as such? Everyone has to learn and if they are learning on the job its up to their employer to ensure that the work product is reviewed or overseen by someone with adequate experience.
In this case, the author exchanged messages with someone, and he indeed claimed as such, according to the screenshots.
This is not the defense they think it is.. If your mechanic rotates your tires and improperly torques the lug bolts "it was my first time using a torque wrench" isn't excusable. It's good to experiment and learn new things. It's not good to throw your little self-study project out into the world with your employer's name behind it and present it as production worthy material.