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The remaining 25% are likely not even BU nodes, but Core nodes modified to fake signal BU
Yes. Poorly written untested code moved to production, with a fatal bug that crashes when sent an invalid transaction message.

The important take-away from this though, is that miners that are signalling for BU remain largely unaffected, which means they're using core software for mining, while signalling BU. That's a vote of confidence to the alternate client.