Read the write up on YellowKey. [1] It sounds like, in at least some instances, he's publishing official Microsoft backdoors probably used by US intelligence agencies et al. It turns out that Bitlocker is insecure and backdoored. Something noooobody expected after TrueCrypt just mysteriously and suddenly shut their doors one day, removed all downloads, and recommended everybody move to Microsoft's BitLocker. lol.
[1] - https://www.tomshardware.com/tech-industry/cyber-security/mi...
It's not a backdoor, Microsoft doesn't need a backdoor to bypass BitLocker because they can sign payloads that'll pass the TPM.
If you were using bitlocker to replace truecrypt, you'd have a boot password and this would not affect you at all.
I'm still far from thinking this is a backdoor. It tricks the boot environment into deleting a file and then it doesn't ask for a password. The exploit is nowhere near bitlocker, the problem is that bitlocker without a boot password requires the whole OS to preserve security from boot through the login screen.
And where's the claimed version that works when a PIN is set?