Ann: Production Update and FY 2019 Guidance, page-24

In this case (thank god) the company is correct in believing that the issue is unimportant in the scheme of things.
and only felt the shortterm guidance was need as data was analysed at th end of a certain period.
did you want them to say in Feb
Market announcement
" the contractor is having trouble sourcing haulage trucks" were not sure exactly when theyre coming or how much it will affect production."
then leave the market open to rampant speculation..

Now if it was important news like mine grade is not sufficient and the mineplan is in jeopardy , .... that would be different.