All of these claims are easily able to be checked from the archived version of the site . It was not using home grown encryption algorithm.

The last version released was independently audited and "found no evidence of deliberate backdoors, or any severe design flaws that will make the software insecure in most instances"

I had never heard of the warrant canary for TrueCrypt, and quickly searching for news of the time, was unable to find anything to indicate that there was ever a mention of NSL on the website, so nothing to remove if they were served with a NSL.