"Pumping" in this context is a very thinly veiled pejorative. The original question is using it in the sense of a "pump and dump" [1]. They're implying that the amount of Rust content on HN is in some way artificial: it's the strike force[2] posting a bunch of articles, or its some startup throwing "made in Rust" in their title for attention, etc.
As you might guess, it's hard to distinguish between a "pump" and general interest in something. And, of course, each probably does feedback into other.
As you might guess, it's hard to distinguish between a "pump" and general interest in something. And, of course, each probably does feedback into other.
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[1] https://en.wikipedia.org/wiki/Pump_and_dump
[2] https://enet4.github.io/rust-tropes/rust-evangelism-strike-f...