> I have never seen this sort of first party teardown for any console or laptop manufacturer

Dell has them at least for their "pro" lineup (e.g. [0]), same for Lenovo [1] or HP [2]. Said "pro" lineup is meant to be serviceable.

It is however the first time that I see a first-party console tear-down.

[0] https://downloads.dell.com/manuals/all-products/esuprt_lapto...

[1] https://download.lenovo.com/pccbbs/mobiles_pdf/t470s_ug_en.p... page 109 onwards

[2] http://h10032.www1.hp.com/ctg/Manual/c04887250