They are available on the submission page if one want to see it. The committee would just prefer they not be as visibly available until we have confirmed the candidates meet the eligibility criteria and that their candidate submission meet the election regulation. This is partly to ensure fairness to all those who stand. Say a candidate submission is too long (as has been the case a couple of time), it does take time for them to correct it. In the mean time, if it were all widely visible, the other candidates can/will complain about unfair advantages gained over the exposure to the longer statement.
KTC
I can also add to this that the translation effot of the candidate presentations will only start after May 22. By chance, all four candidates presented themselves in English - but it would be perfectly legal to them to do it in other languages, and indeed the mothertongues of two of them is not English. A premature exposure of the presentation in different languages (i.e. before the translation is completed) would also make the chances unequal.
Cheers Yaroslav