There is an element of language difficulty here. I'll try to make my point succinctly, but please bear in mind that lawyers have difficulty being succinct. Bajo is a case point.
Professional secret - what does this mean?
There is no dispute that a lawyer (English/US) can not ethically disclose confidential communications made to him by his client in the course of his representation. That appears to be the rule in Argentina, too, although Bajo expresses this concept somewhat inartfully (after all, English is his 2nd language) as "you cannot share what you know about your client." Presumably, Bajo means that a lawyer is prohibited by the rules of professional conduct from disclosing confidential client communications. A lawyer may share other stuff "he knows" about his client, i.e. his size, his public address, even his statements made to the lawyer which are not confidential (made in the presence of others for example). However, Bajo doesn't limit the definition of professional secret to confidential communications between client and lawyer aka what the lawyer knows about the client.
Apparently, Bajo also uses the term "professional secret" to mean 2 other things. One is the intelligence and knowledge of the lawyer (here himself). About this we have no dispute. A smart lawyer is not obliged to share his expertise with others, layman or lawyers, much less try to educate others in an online chat forum.
Bajo's second other definition of professional secret is the status of current law based upon a very recent decision (his own successful work) as a good, but "secretive" precedent for winning future cases. This would not be considered a secret in English law. First, because all appellate decisions of every court are published immediately for all conscientious lawyers to read and use. Accordingly, decisions do not remain secret. (Trial level decisions are not binding precedent on any other judge/court in English/US law). Secondly, an obscure or recent case law decision is not a secret because all lawyers are ethically obligated by professional rules of conduct to report to the judge during any proceeding all known precedents that would be pertinent to the case EVEN IF it is not in support of that lawyer's position. That may not be the law in Argentina - I don't know, but in the context of this discussion this kind of "secret" ( a good precedent that other lawyers don't know about) is moot. Bajo knows about it . He caused it and he will presumably always bring it to the court's attention in any proceeding. That he chooses not to share it with us (or competing lawyers) is, again, his prerogative, however he should not expect others here to fathom his arguments unless he does so.
Moreover, because he chooses not to share his recent case success and because he should realize his refusal to do so undermines his position in this debate, he should have made that very clear from the beginning and not engaged in vitriolic public exchanges with those presumably less informed. It's not very professional. The last word is not always the correct word.
Now wtf were we talking about?