I'd like to think there's more to Adventureland than it just being the dumping ground for content that doesn't take place in Western Europe or the USA.
The land is clearly grouped into geographic clusters, starting with the South Pacific near the hub and then moving to Africa and South East Asia. You could basically draw a line from LA to Cape Town and plot along that path various cultural points of interest that influence the land. The land also now has a clear time frame with the 1930s.
Tarzan worked because it's both set in Africa and part of a larger literary tradition of Adventure stories for Western audiences, and his prominence in movies really peaked in the 30s. Like Aladdin, he existed in media long before his Disney adaptation. Indiana Jones, also draws from this tradition, albite with movie serials rather than written stories.
There isn't as strong a connection to South America in the land, despite references to the Amazon in Jungle Cruise. Encanto is also a story that focuses on family dynamics vs one of exploration. Like you and others say, it mostly takes place in a house.
Visually, it shouldn't clash too bad, and I never cared for the Tarzan overlay, but this feels like a 90s-era quick fix to promote a recent release instead of creating something more substantial for the property. An Encanto show/parade makes more sense to me than a treehouse. The little brother's bedroom was not a major focus of the plot and just one minor location, unlike Swiss Family Robinson where the treehouse was a symbol of the family's survival and a frequent setting for the story.