Unfortunately, it doesnt look like this will get fixed in time.
Also: see another existing topic in regards to this :
https://www.bungie.net/en/Forums/Post/261413560?sort=0&page=0
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Wouldnt worry too much, such a time sensitive truimph will no doubt either be auto completed for everyone or retro awarded over the coming weeks.
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Doubt they'll do either. The triumph isn't tied to one season and was still possible albeit at a slower rate. Also rep gets reset in a few weeks and you can't reset Saladin again after tomorrow This is just gonna be a 'we messed up but there's always next time'