Both transcripts (English) cite only the 2June'78 landing, neither transcript mentioned any "bounce"
JAL's English -abridged AAR-translation mention's the 2Jun78 landing,
only citing a "hard landing".
The OP is quoting from part of a recent long and rambling reader's letter to Aviation Week/BCA, which doesn't quote any source for the information.
Workload Mishaps: Flap Mismanagement Leads To Near Stall Of An ATR | Business Aviation content from Aviation Week