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The encrypt it is sure.
AxCrypt is an optimal one and easy program that after to have encrypted the files can cancel in non-recoverable way the files it originates them. However, currently, on drive compressed is guaranteed the single normal cancellation of the files originates them and to such operation the message refers.
The encrypt always it is executed on compressed drive and not.
As soon as you can you remove the option "Compress drive ..." that slows down the operating system.
Optimal and an easy one utility for the non-recoverable cancellation of the files is "CyberShredder" (free and also standalone).
Regards, Zazza