Slayer Instruments were unaffected by the change to Slayer Damage, as they do not do damage.
Super slayer instruments are as effective as their specific slayer counterparts (dragon slayer is equivalent to reptile slayer when used on dragons) . Using and opposing slayer type instrument still incurrs the same penalty.
To reiterate, nothing has changes with how slayer instuments work, so the bardic calculator is still current. Feel free to dig through the FOFs on that explained the change to slayer damage only(they are a pain to search through).
Stayin Alive,
BG