Where did he assert DL was the “best park in the world?”
As it happens, DL and MK provide for numerous comparisons in terms of park layout, thematic organization and integration, and overall ride experience.*
The ROA is largely unique to both parks, and yet DL manages to keep making theirs work despite numerous internal and external barriers to further expansion. Despite the absence of those barriers in Florida, WDW has determined their ROA has to go.
*I personally feel DL has many more advantages over MK in many of these categories.