I know I've said before that it is obtainable, but recent research into the plan and its loot list has revealed that this is not the case.
Currently the plan recipe_mod_melee_DeathclawGauntlet_Hook "Plan: Deathclaw Gauntlet Extra Claw" [BOOK:002B42C6] is part of the loot list
LLD_Creature_Deathclaw [LVLI:0002EF6C] -> LLS_Creature_Deathclaw [LVLI:0008E3AE] -> LLE_Creature_Deathclaw [LVLI:0008E3AA].
The direct list for this being LLE_Creature_Deathclaw [LVLI:0008E3AA]. This list has a [LVLG: Chance None Global Value] that points to ExtraMeatChance [GLOB:0008E3A7] which is set at 100. This means that this loot list (along with others that mostly only contain meat, junk, or small amounts of caps) has a 100% chance of not having anything pulled from it.
Unlike a lot of other loot lists which have globals named something like LL_Container_ChanceNone_ZERO_ECON [GLOB:00369793] or LL_Container_ChanceNone_Medium_ECON [GLOB:00361350] this one seems to be named as in this is the chance you should have to get extra meat. This causes the entire list to be unaccessible.
Other loot lists that are inaccessible:
LLE_Creature_Bloatfly [LVLI:0008B134], LLE_Creature_Bloodbug [LVLI:0008E3A9], LLE_Creature_Deathclaw [LVLI:0008E3AA], LLE_Creature_Brahmin [LVLI:0008E3AC], LLE_Creature_Brahmin [LVLI:0008E3AC], LLE_Creature_MirelurkMeatExtra [LVLI:0008E3AF], LLE_Creature_Molerat [LVLI:0008E3B0], LLE_Creature_Radroach [LVLI:0008E3B3], LLE_Creature_Radscorpion [LVLI:0008E3B4], LLE_Creature_Radstag [LVLI:0008E3B6], LLE_Creature_Stingwing [LVLI:0008E3B7], LLE_Creature_YaoGuai [LVLI:0008E3B9], LLE_Creature_Wolf [LVLI:00110A4A], LLE_Creature_Angler [LVLI:001115FF], LLE_Creature_Angler [LVLI:001115FF], LLE_Creature_FogCrawler [LVLI:00111626], LLE_Creature_Chicken [LVLI:001119D3], LLE_Creature_Rabbit [LVLI:001119D4], LLE_Creature_HermitCrab [LVLI:001119D5], LLE_Creature_CaveCricket [LVLI:00112EE2], LLE_Creature_RadAnt [LVLI:00112EFB], LLE_Creature_RadRat [LVLI:00114882], and LLE_Creature_Behemoth [LVLI:00356BDF]
I know most of this means little to a lot of people, but the TL;DR is that the extra claw deathclaw gauntlet plan is unobtainable as of right now.
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