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No it doesn't. It says trips will be awarded in inverse seniority order within days of availability and RAW group unless there is a YS. In that case, it's not inverse seniority, it's in seniority order.

Here is what the SRH says, which is as good as contract language.

"Open time is awarded/assigned to reserve pilots within the days-of-availability grouping that matches the length of the rotation(s) being covered, beginning with the lowest RAW bucket and then progressing to higher RAW buckets. Within each RAW bucket, pilots who have submitted yellow slips (YS) are considered first, in seniority order. If there are insufficient pilots who have submitted a YS, then the remaining pilots are considered in inverse seniority order."