Is colombianos then closer to that “Miami” Spanish I am talking about ?
Partially. Miami has a large Colombian community but Venezuelans have arrived in large numbers over the past decade and their accent is very similar to Colombia. You have to know them well to distinguish.
On Univision, Telemundo and CNN en español it’s a mix. You have Spanish journalists from quite a few countries but many are Colombian, Mexican, Argentinian (but for most part with a neutral accent except the ‘sh’ pronunciation) Cuban and Puerto Rican.
Miami Spanish is predominantly Cuban Spanish though and different when you go into certain neighbourhoods. For ex, Doral, a city in Miami is almost 100% Venezuelan.