From the NBC newsite:
Trump spoke of his concerns over a proposed wind farm, mooted to built near his new GBP 1 billion golf resort, telling the Scottish Parliament that they will destroy tourism in the country
1 archaic : to discuss from a legal standpoint : ARGUE
2 a : to bring up for discussion : BROACH, SUGGEST b : DISCUSS, DEBATE
3 : to deprive of practical significance : make academic
[merriam-webster unabridged]
In this context, mooted=proposed or suggested.
"Moot" is still used in legal debate, for trainee lawyers practising.
And "a moot point" is common(?) for something that can be argued over?
Sure, no problem with moot - but that construction following is as ugly as Trump's plans, at least this side of the pond. Does it sound right to USn ears? We might write mooted to be built... but never 'mooted to built'.
perhaps they muted the 'be' part of 'to be built - here's another version of the story:
Trump said he would never have begun his project on the east coast of Scotland if he thought the mooted wind farm was a possibility.