Your Charts app is set to CAO mode (where only charts for which a Jeppesen airline-optimized “commercial airline overlay” version exists are presented). Presumably your operator’s charts app only presents such charts as well.
That does not mean other charts or approaches do not exist in the “standard” mode:
If you look at the corresponding charts, the additional approaches are only applicable and available to category A and category B aircraft, which would explain why your operator does not have them in its database and/or charts.
Operator-specific references (e.g. those of a specific airline) are not sufficient and/or appropriate, as they (very often) omit approaches available to the general public (e.g. those only available to smaller, non-airline aircraft, as above) or the opposite, sometimes they include private approaches only available to specific operators but not the general public.
Without any additional data from the official Seychelles AIP, it would be foolish to assume Jeppesen just came up with and/or updated charts for non-existent approaches.
The Seychelles AIP data appears to be available for 25 dollars (without precision as to whether it comes in electronic or printed form), but I am not going invest my own money just to verify this, and while it’s their decision, I suspect it would not make good business sense for Navigraph to do so either, just to address one user’s report (especially since there is a high likeliness that the approaches do exist, since they are charted by Jeppesen).
Regards,
Tim