No; Trail of Bits has always had multiple internal groups, including an OSS engineering group that does security and performance engineering. We still do plenty of audits as a company; you can see recent work on that front here[1] :-).
In addition to what Will posted, published reports for blockchain projects tend to be skewed compared to our other groups.
Blockchain clients tend to want to publish the report, but that isn't true for our business lines/projects/clients that are more interesting to HN's audience.
Source: I run the group that produced this work.
[1]: https://github.com/trailofbits/publications