I brought this up in #super-mario-64, and the minor consensus is that 100 Coins is "possible", the same way Red Coins is possible.
According to a FAQ online, DDD has 106 coins. That means you are still required to get at least 5 of the red coins in order to get the 100 coin star. If we already have a rule stating the Red Coins require the sub to be removed (by reaching Bowser in the Fire Sea), it should apply to the 100 coins as well.
The consensus on it being "possible" was that it requires a very specific triple jump. There is no "Strict" category for this since it isn't caps/cannons-based, but it is extremely unreasonable to casual play. If you want to sequence break it, go for it, but I don't think it should be expected.
* SM64: add painting name to location hints if area randomizer
* SM64: fix BitFS access logic
Using can_reach regions in an entrance's logic is unsafe because reachable_regions won't be updated if no progression locations are reached. can_reach location is safe.
* SM64: rework logic for correctness and consistency
- BoB Mario Wings to the Sky is extremely difficult with cap and no cannon, will never be required
- DDD Collect the Caps no longer requires metal cap except on strict cap
- Cavern of the Metal Cap red coins no longer requires metal cap except on strict cap
- CCM, TTM, WDW cannons added on strict cannons for their expected stars
- BoB 100 coins requires cap or cannon if both are strict, since only 99 coins are available otherwise
* SM64: write entrances to spoiler log
* SM64: tweak format of WDW cannon rules
