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Yes money was allocated to defending seats in 2017 that turned out to be safe. That was because, like everyone else, Labour in 2017 believed the outcome of the Brexit referendum would result in a surge for the Lib Dems. (Thread)
When that surge didn't happen - for various reasons - it looked like that money was wasted, but hindsight is a wonderful thing. That does not constitute "fraud".
Yes HQ ignored and sidelined Corbyn's office. That's because HQ were competent professionals. When you look at what the people who were ignored in 2017 did in 2019, Christ can you blame them? This does not constitute trying to stop the party winning. In fact, the opposite.
Corbyn has never taken responsibility for the consequences of his actions, not once. This is a desperate attempt to find someone else to blame, because he is too much of an immature child to accept that he caused Labour to lose in 2017 and 2019. And likely 2024 as well.
Just because toxic Corbynites want to wallow in a poisonous Dolchstoßlegende doesn't make it true. They want to have been stabbed in the back because it let's them off the hook. No. Brexit. Boris. Everything that those things caused. Corbyn did that, as did his supporters.