I'm the first person to advocate for researching everything and DIY but the comments from the tax professionals in those articles are, at best, extremely broad and not applicable to realistic scenarios, and at worst misleading.
Setting up a foreign corporation as a tax shield is a common trick and most tax authorities worldwide, including AFIP, have extremely broad criteria that allow them to disregard them if there's grounds to believe the sole purpose of the corporation is to avoid taxation in the country where the work is performed. If your "company" is essentially just you doing the work but then sending out an invoice with your LLC on the header, then yeah, you're gonna get hit with taxes for that.
Getting paid with crypto and bringing in the equivalent amount of pesos is also a "grey" area and very much something that mostly works now because BCRA doesn't actually practice enforcement.
Of course, most freelancers don't report income at all and coast by on AFIP never noticing them, so it might be a moot point.