No it wouldn't. Earnings per unit are calculated after interest...

No it wouldn't. Earnings per unit are calculated after interest costs so would not have the same effect on interest cover ratio.

At the extreme, a 30% fall in revenues would reduce net income (after interest) by a bit more than half.
If I have $11K revenue to cover $5K in interest (2.2 x IC).

Doing the sums on the Half yearly, a 30% fall in revenue would still allow an interest coverage of 1.45 x.

Thankfully, a 30% fall is unlikely in the next year as most rents are locked in. Over the next 3-5 years its a possibility (although the grape/vineyard oversupply may have dissipated so IMO a 30% fall is not likely).
Even still, by then loans outstanding would have reduced. Worst case, a small capital raising would ensure the covenants were maintained.
At current prices, this likelihood seems priced in, but I could be wrong.