It would be a huge feat to actually develop from scratch a reliable satellite of this scale domestically. Developing a satellite or satellites would be doable -

It would be a huge feat to actually develop from scratch a reliable satellite of this scale domestically. Developing a satellite or satellites would be doable - there's a number of startups which have developed smaller satellites from scratch (although generally the people involved have experience working for the big western contractors) - but you'd need to start small and work up. It is true that this appears to be mostly an assembly of other people's technology, but then that's true of almost every large scale system. Most aircraft makers only actually build the shell and assemble it all, the rest of the sub-systems coming from numerous suppliers. In this case Thales Alenia Space and Airbus Defence and Space (both European companies) appear to have provided most of the satellite systems, with the system engineering level design done by INVAP. I'm not sure where it was assembled - possibly also Argentina? It's worth noting that the Systems Engineering component is no easy feat, and if they have done it then they do deserve significant credit. Ultimately no company anywhere in the world is completely vertically integrated - there will always be suppliers.