I'm still confused on why you originally wrote "ML has to release the go ahead" as you then indicated the Provincial direction. But I'll move on.
As for the design review, this was mentioned in a stakeholder meeting with Metrolinx staff and maybe in a staff report or verbally at at Brampton Council.
As for the $200k cost,
@ShonTron in his Gateway FOI article had a reference to it being higher than that at $15-20M.
Frustrated by Metrolinx’s responses to my questions about pedestrian safety at the northern terminus of the Hurontario LRT, I submitted an Access to Information request to the provincial agen…
seanmarshall.ca
While it's not in article, my understanding is that there is a major water/sanitary pipe under Steeles that would require moving. Presumably this was part of the original cost in the 2014 TPAP for the full route into downtown Brampton.