Even disregarding the closing phrase, I have my questions about the sense of the original message. If the goal is really to acquire the PPL , one must take a certain minimal hours of instruction (wasn't it 45 hours originally, and later increased?) on a plane OF THE CATEGORY and even after having learned on a microlight one will still have to fly so many hours on the C-152 or whatever, which will still cost the same.
Beginning on a microlight will not do anything to reduce the budget for the PPL, though it might be a cost-effective way of becoming a better-than-minimal PPL'er.