Personally I think it needs to be made explicit that things inside transports and things outside of range or line of sight are eligible targets, in FAQs both for losing assaults and shooting broken formations. So I guess that is disagreeing with Geep

Likewise this is an FAQ so IMO it's OK to refer to specialist abilities where they are directly relevant.
Think the deathstrike thing is a bit of a red herring though, the FAQ for shooting in question is about extra hits on broken formations so not sure how it could be a problem?
So I would do:
1.7.5 Transport Vehicles
Q: What happens to transported units when the unit transporting them is destroyed from an additional hit from a Blast marker on a broken formation?
A: Units inside transports can themselves be allocated such hits immediately after their transport, but any that remain make their normal armour save or a 6+ cover save.
1.12.7 Work Out Result
Q: Are the extra hits the losing formation suffers only applied to units that were directly involved?
A: No, the extra hits represent the disruptive effects on the formation of losing the assault and so are applied to any units in the losing formation, including for example units outside of 15cm and units inside transports. The only units immune to these hits are those with the Fearless specialist ability.
1.13.4 Blast Markers and Broken Formations (new FAQ)
Q: Which units in broken formations are eligible to be allocated the extra hits from blast markers?
A: Hits are allocated front to back against any unit in the formation, including units out of shooting range and units inside transports. The only units immune to these hits are those with the Fearless specialist ability.