There is another issue. Here [2] where the first computer in Brazil also arrives in 1957 and it is not included in [1]:
> 1957 - A Univac-120 arrived, the first computer in Brazil, acquired by the Government of the State of São Paulo, it was used to calculate all water consumption in the capital. It occupied the entire floor of the building where it was installed. Equipped with 4,500 valves, it performed 12,000 additions or subtractions per minute and 2,400 multiplications or divisions at the same time.
So, we need to check which of those two computers arrived earlier.
BTW, there is an article about Argentina and computers in a complex political moment [3] (as usual). It also touches the computer science field itself beyond the hardware involved.
The first computer built in Latam was in Argentina, it started in 1958 and was finished around 1962 [4].
[1] https://en.wikipedia.org/wiki/History_of_computing_in_South_...
[2] https://tpilmg.wixsite.com/tpilmg/en/historia-dos-computador...
[3] The First Decade of Computer Science in Argentina: https://sedici.unlp.edu.ar/bitstream/handle/10915/24033/Docu...
[4] https://mapmeld.medium.com/first-computer-by-country-81fa479...