There’s precious few places on earth that don’t have room for landfills, and those places will be shipping their refuse whether it is sent as “recycling” or as trash. The article also points out that incineration is an option to reduce volume, but expensive.
There are cases of shipping trash around, but it has more to do with it being cheaper to send a container of garbage somewhere than dispose of it locally.
Can you give a specific example of a rich country that is "ship[ping] trash over to low-income countries" in 2026? It must be a tiny minority at this point.
It's much more the case that we ship plastic to be recycled to other countries than trash. The problem is that then the unrecyclable plastic mixed in often ends up in rivers.