Can you provide the examples though?
Lets take two featured in the video:
Bell Ribeiro-Addy was backed by Momentum, true. But she was also backed by Unite, ASLEF, TSSA and BFAWU, as well as high-profile left-wing MPs and shadow cabinet members, plus Streatham Labour Left.
She was also born and grew up in the local area. picked in a selection process.
A key Labour left victory took place on Saturday, as Bell Ribeiro-Addy won the Streatham selection contest and…
labourlist.org
Zara Sultana
Born and bred in the West Midlands, from Birmingham, 26-year-old Sultana ran as a Labour candidate to represent the region in May’s European elections and works for the regional party.
As a Unite workplace rep considered to be on the Labour left, the successful candidate’s campaign was backed by Unite the Union, Momentum, the FBU, CWU and BFAWU.
Zarah Sultana, one of the Labour Party’s community organisers, was selected on Thursday to replace retiring incumbent Jim…
labourlist.org
Claudia Webbe was "parachuted" I will give you that, but only because Keith Vaz chose to retire on the 11th of November, by which time it was too late to run a selection process. Although she was born, grew up and went to university in Leicester, so perhaps saying she was parachuted is unfair given the usual connotations.
Claudia Webbe – a high-profile Islington councillor and member of Labour’s ruling body – has been chosen as…
labourlist.org
Check out the Vauxhall selection process. The winning candidate is reported to have won on second preference votes instead of the momentum backed candidate, because those voting for the momentum candidate didn't want the leadership backed Ibrahim Dogus to win. This seems to run against the picture you were painting of momentum being Corbyn's loyal 5th column parachuting stooges into safe seats
Labour’s Super Sunday has arrived. Selections are concluding today in: defector seats Nottingham East and Liverpool Wavertree; retirement seats Bassetlaw, Poplar…
labourlist.org