I would agree. But isn't it true that our spirits as well as our walk are being progressively sanctified?
Sins (filthiness) of flesh would be sins of the body, fornication, sexual immorality, drunkenness, drug abuse, sensuality, etc. .
Sins (filthiness) of the spirit would be anger, wrath, malice, pride, unforgiveness, vanity, etc.
Neither our bodies nor spirits are perfected yet, but the Holy Spirit in us is perfect.