Not sure what you are trying to say mate. I don't particularly want to argue but the link is to an opinion piece from a now defunct legal firm from Eastern Europe and there will be differing jurisdictional issues in plain contract law setting aside FIFA Regs.
If your point is that Richarlison could breach his contract and pay the remainder up and then appear at another team I disagree.
If your point is that he can tear up his contract and he and his new team would be liable for compensation not limited to the terms of his contract and potential sporting sanctions then I would agree with you.
Even if you look at the article it summarises as follows (the but is important):-.
A player may unilaterally and prematurely terminate the contract even without just cause, exercising his fundamental right of freedom of movement, though simultaneously violating Article 13 of FIFA Regulations and principle of pacta sunt servanda, but from another side he will be subject to severe consequences for such termination (compensation and sporting sanctions) available under Article 17.
In the CAS Summary its suggested that compensation could be the costs of replacing that player with add ons.
In other words the new team or Richarlison could be liable personally for his value on the open market. A further issue is that if he were to join a Premier League side he would be in direct competition with us and accordingly there is an arguable case for an injunction under domestic law. If we were in Europe competition then conceivably it could also be extended to a specific European competition.
So yes, he could but it would get very messy indeed for him and could be ruinous. For any team that he signs for it could be messy and more expensive than a transfer and they may be deprived of his services for a period of time.
With the world cup nearly on us Richarlison would have to be very badly advised to take that route.
We don't hear about it a lot because of the above but the Webster ruling, with respect, related to a player of low value in relative terms and therefore the compensatory element would have been very low. It's therefore more applicable to easily replaceable players which correlates with the general employment contract law position.
.