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Thank you very much!
Yes, the sighting is in waarneming.nl, where the pupa of a Asilidae was suggested, changed into a Exuviae: https://waarneming.nl/waarneming/view/163148985
Discussion on forum here: https://forum.waarneming.nl/smf/index.php?topic=439827.0
Villa hottentotta has never been seen in my garden, for what it is worth.
Spotted in my garden over the years are only B. major and B. venosus.