I should have thought of that earlier.
Those aren't indexes. They're automatically created column statistics. The query optimiser creates those to better know the data distribution within a column.
You can drop them. SQL will recreate them if necessary.
For each of the entries in sysindexes that begin with _WA_Sys, run the following
DROP STATISTICS auto.<Statistic Name>
Statistics can indicate a column where an index would be useful, so you may want to watch which columns get stats and consider creating indexes on them. Also, from what I saw of the column names, your table is highly unnormalised. Is that intentional?
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