Not sure you are correct - The October NTA report issued in November set out why they wrote it off in October.
"Bailador has determined to write its investment in Brosa down to zero. It has been 12 months since we last valued our investment in Brosa and during that time, market valuations for technology companies have reduced significantly. Compounding the fall in market multiples, Brosa is discretionary spending exposed and susceptible to the on-going headwinds facing the economy Bailador will continue to monitor Brosa's performance and as with all investments, to value its investment conservatively."
I suspect they knew a bit more but could not say too much then but took the pain.
It constituted 3c per share. Probably not material.
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