This expansion is the last one although actually many more in the next decades were already approved and contracted, which got renegotiated with the energy companies. But of course this was already mispresented earlier this year when everyone reported on Germany destroying the village of Lützerath for their newly started coal digging when it was actually the last one (with half a dozen more similiar small villages originally scheduled for destruction more than a decade ago). But lobbyists pay to push lies and publications love the clicks for the popular outrage about evil Germans. Who cares for facts, anyway...
Those wind power plants were originally build with the knowledge that they have to be disassembeled in less than a decade again. Also those models proved to be very problematic and the company building them went out of business after only 4 years (since then there was only some auxiliary technical support from other companies).
Counter question: How economical is it to stop digging up coal today when the phase-out is 7 years away. They can either increase the pit or dig deeper. The latter is not only more expensive but also more damaging (pumping groundwater away from the hole etc.).
PS: A decade is also the usual life time of a wind power plant nowadays... After that time the gear boxes and blades need to be replaced and the foundation needs to be checked because of constant micro vibrations... In theory the installation itself could run up to 30 years but the technical development is still moving ahead so fast that replacing the whole thing with a newer and more efficient (also often bigger) model usually makes more sense than replacing parts to keep them running. So for now wind turbines are rather short-lived as their replacements see constant substantial improvements.