First, I don't think there is any question--most scorekeepers, even at the highest levels, do charge an error for CI.
However, there have been changes in the scoring rules. The section that is now numbered 10.16 used to be 10.18, and this change occurred in 2006/7. Interestingly, the rule used to say "In determining earned runs, the official scorer shall reconstruct the inning without the errors (which
include catcher’s interference) and passed balls,....."
Now, as quoted above, "include" has been changed to "
exclude". Furthermore, the entire second quotation (which deals with scoring following CI) in my above post is entirely new for the rules as released to the public in 2007. (I believe the changes were effective in spring of 2006, at least in MiLB.)
So I speculate that CI used to be included in the category of errors, and is now excluded. But that is only justified by a literal reading of the phrase "errors (which exclude catcher's interference)". If the rule said "errors (excluding CI)", then it would be consistent with your interpretation.
On the other hand, as you say, the rest of the rules don't distinguish between the various types of interference.
I can't believe I've spent the time typing this up! It is surely not very important.
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