Ive used 8 skeleton keys on taniks (yes, i have counted), getting the keys aren't the issue. its the fact that every time i get a key, i save it till i get the taniks strike, but when i use the key, i get the 'does not bow' every time. i feel it could be bugged or something. because no cloak after 8 keys is just odd.
Edit: Since making this post ive used 2 more keys and gotten 2 more 'does not bow' auto rifles, no luck yet. :/
Edit 2: FINALLY GOT IT. 12 KEYS LATER!
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Yes. I can confirm that you can. I got it on my very first skeleton key on the shadow thief strike