You would expect cashflow customer receipts to be roughly equal...

You would expect cashflow customer receipts to be roughly equal to revenue under the following circumstances:
1. The company had been perfectly stable at no revenue growth for approx 3-4 years prior
i.e. performing roughly the same amount of business consistently for the entire period
2. The company had been mostly correct in estimating which cases it would win or lose for all of those 3-4 years

These things have not been the case. Shine has not made major acquisitions recently, but it has made acquisitions during the last 4 year period, and there has been some organic growth. As such cashflow will be lower than revenue.

Note also that revenue's equivalent on the cashflow statement is 'Receipts from customers'. It would not be fair to compare it to (say) net operating cashflow.