I dont think you got what i meant. I mentioned them being anti imperialist as in against the US Empire. I wasnt saying Brazil would do colonialism.

Brazil is the largest nation in south america and they will dominate the region after the US empire falls. That doesnt mean theyll do colonialism. It just means nobody will be strong enough to directly go against them and theyll generally get their way in disputes, and probably act as a mediator in disputes between other regional actors. Brazilian leadership is likely aware of this and has no reason to want to help other south american countries grow their own economic forces right now despite an alignment against US imperialism. Since doing so would lead to a potentially stronger rival down the line. Especially somewhere like Venezuela which with its massive oil reserves has a ton of economic potential. Brazil will want to basically be the go to south american nation for other nations around the world to talk to if they have any interests in the region.

South America is also rather geographically isolated. This lends itself to stability in the region so long as there isnt an internal conflict between south american states. Brazil would likely seek to prevent a conflict like this by simply being too powerful for other states to try challenging them. So preventing growth in those potential rivals now is beneficial to Brazil long term.

All nation states are self interested. This does not mean they are acting in an imperialist way. Its not colonialism to be selfish. Even if colonialism is itself a selfish thing to engage in. You can see this in Chinas statement. The Brazilian and Chinese relationship is mutually beneficial. Both nations see a benefit from it. If Brazil sees no benefit for themselves in helping Venezuela they arent going to.