They're not even doing that. lol The extra seats are already there and always have been; they're applying for permission to be able to use them under a renewed lease agreement. Capacity of the stadium since its post-Olympic reconfiguration has always been 66k.
West Ham moved into the London Stadium in 2016 but previous licensing regulations had limited the stadium's matchday capacity to 57,000, with 9,000 seats unavailable for use.
West Ham are looking to increase the capacity of the London Stadium in order to become the biggest club ground in the capital.
www.skysports.com
They want to move some tarpaulin at the back, that's all.
In fact, they already did this once in the middle of last season, to get from 57k to 60k:
www.whufc.com
Hmmm....not really. Initial plans in 2008 were for 58k, which went down to 56k when we added a single tier south stand. Then we changed architect a few years later, and the new design was 61k which on completion (with a few tweaks) became 62k.
The only plan we had in the low 50,000s was an early 2000s plan to redevelop WHL, which Levy quickly scrapped in favour of a new build: