Perhaps he's promoting some other JVM language -- he did mention Java and Groovy. If you type "Groovy" into HN search, you'll notice more than the usual amount of Groovy stories being submitted over the past week, and the recent comments mentioning "Groovy" are scattered around different submissions rather than clustered as usual. Groovy has more than doubled its percentage on Tiobe between January and February (if you get what I mean), and its project manager has just finished running a campaign among his Twitter followers to double its Github stars from under 600 a month ago. Because the Groovy and Grails project managers are now competing for their funding, expect to see more comments of that nature.