What version of Julia are you on? The following works on Julia 1.4:
julia> x = [1, 2, 3]; deleteat!(x, BitArray([0, 1, 0]))
2-element Array{Int64,1}:
1
3
julia> x = [1, 2, 3]; deleteat!(x, [false, true, false])
2-element Array{Int64,1}:
1
3
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