Thanks for the catch; correction made.
Yeah, ambiguity is not such a great problem unless you are talking to machine. Still, it is nice to avoid unnecessary sources when they are easy to fix at the beginning. So far as I can tell, jan Setepo (morpheme addict, I think) hasn't done anything much on the grammar in over a year, maybe hoping for things to settle down, maybe just swamped by the details that are emerging and jan Mimoku (la pingvino, I think, but things got really confused as far as names go there for a while) less. My grammar-writing days are so far behind me (and dealt with such relatively simple grammar types) that I can no longer remember what constitutes a BNF grammar or a phrase-structure one, for that matter. I get by for illustrative purposes with crude G&T and for an occasional snow job a piece of Montague.
Sure, short sentences and lots of them are just stylistic choices, but the tp philosophy is said to favor them over deep structures, so normative. And it does dodge a lot of problems, including many ambiguities. It is also boringly long and repetitive, of course.