Deciphered Letter to Emperor Charles V

In 2018, I solved a cipher in a letter (1529) to Emperor Charles V from Suarez de Figueroa, Spanish ambassador in Genoa and reported it in "Codebreaking of a Spanish Cipher with Vowel Indicators". Since I don't know Spanish, the deciphered text was no more than preliminary. Now, thanks to Demetrio Martín Vilela from Argentina, I made many corrections to my preliminary deciphering. I believe now it is almost a decent text in Spanish (though some parts are puzzling even for the native Speaker of modern Spanish). Martín even provided a quick English translation.