Mackenzie certainly planned an 18 hole course for Pontefract, there is much evidence of that. Here is a report in the Yorkshire Post (Leeds) of 1 May 1920:
This ties in with the information in the club's history book that Mackenzie visited the site in April 1920 - Duncan, this date is in the Mac Timeline, so you must have missed it
He prepared a plan for an 18 hole course, although initially the club had said they could only afford to build nine holes in the first instance, but Mackenzie explained they could build 9 as part of an overall 18 hole layout.
Mackenzie recommended Franks Harris Bros as the contractor - in the days of the Colt Mackenzie Alison partnership they seemed to be the partnership's preferred contractor - but once the club did their sums they realised they didn't want to pay for a contractor and Mackenzie as well. Mac then offered to superintend the works himself for 150 pounds but it seemed the club went off on their own, engaging Williamson, the professional at Garforth to supervise the works. It would seem that Mackenzie was sidelined. How closely Mackenzie's routing was followed by Williamson is hard to say, but claims of "Mackenzie" greens might seem a little ambitious if Mac was not involved. Whether he did draw green plans that they later followed is not known, but somehow I doubt it. The club appears to have been happy with the services Williamson gave them and the course he constructed for them.
Just looking on Google Maps the course today bears no resemblance that I could see to Mackenzie's routing plan at all.
So is there any Mac in today's course? Seems highly doubtful to me. So another case of Mackenzie planning a course but his plans not being followed, yet the claim being made that it is a "Mackenzie" course.