Wigan and Huddersfield administration?

[wrinkly]

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If Huddersfield decide to go into Administration before midnight this Thursday it's 12 points this season - if it's afterThursday it's deducted next season.

The first part is correct. The second point isn't
After Thursday if the club would have been relegated EVEN WITHOUT THE POINTS DEDUCTION, the deduction applies next season.
If the club would have stayed up WITHOUT THE DEDUCTION then the deduction would apply this season. Which may or may not result in relegation.
EFL rules 2022 - 2023:
12.3.1 during the Normal Playing Season but prior to 5.00pm on the fourth Thursday in March, the points deduction shall apply immediately;

12.3.2 during the Normal Playing Season but after 5.00pm on the fourth Thursday in March, Regulation 12.4 shall apply; and

12.3.3 outside the Normal Playing Season, the points deduction shall apply in respect of the following Season such that the Club starts that Season on minus 12 points (including in the National League if appropriate).

12.4 Where the circumstances set out in Regulation 12.3.2 apply and at the end of that Season, having regard to the number of championship points awarded (ignoring any potential deduction):

12.4.1 the Club would be relegated in accordance with Regulation 10.1.2(b) or 7.7, the points deduction will apply in the next following Season (including in the National League if appropriate); or

12.4.2 the Club would not be relegated as aforesaid, the points deduction will apply in that Season and Regulation 10.1.2(b) or 7.7 will then apply (if appropriate) following imposition of the points deduction.