[…] I eventually tracked it down to any mention of "phone" number or "telephone" number which I had to change to "contact" number before it was happy. […]
You’ve had this problem already over a year ago.
[…] Phone numbers are evil. […]
I don’t think writing “phone” (or “loan”) should trigger the spam filter. There are better mechanisms to detect malicious edits (take a look at Wikipedia), yet installing/configuring/maintaining them might not be as easy as a mere blacklist may be.