Ace, the truth is there.
It says packages up to 82k for a DEC, and the small print at the bottom of the page tells you that you can achieve that with maximum seniority. On the same page it tells you that a turboprop captain will be earning 55k after two years, including flight pay. Flight pay is probably about £300 per month, and as the pay increments are about £700 per year you would probably start on about 53 including flight pay.
They may be accused of untruths at times but that looks about right. It isn't as much as you can get as a jet captain elsewhere, but for someone with only 2500hrs - I'm not saying that is you, of course - it isn't that bad if you get a base that you want (remember that after 2 years they are putting 12% into your pension, you don't pay up front for your training, you don't pay for your uniform, they provide health care and LOL insurance etc and you are on full salary from day one and you don't have to pay your own hotel bills when training).
Although it might not be obvious from some of the posts on pprune there are certainly worse places to work than flybe.