The orignal Airworthiness Directive (linked in the article) reference a Service Bulletin which defines the necessary updates.

Basically there is a patch available since 14 August 2018. The Directive does no longer apply as soon as an airline installs those patches. Seems like Boeing is trying to spread FUD...

Quotes from the Directive:

Modification of an aeroplane in accordance with the instructions of the SB constitutes terminating action for the repetitive ground power cycles (resets) as required by paragraph (1) of this AD for that aeroplane.

Airbus SB A350-42-P010 original issue dated 14 August 2018.

[...] by providing passengers with the possibility to undergo alternative screening methods, this Regulation, together with the specific implementing rules adopted pursuant to Article 4(3) of Regulation (EC) No 300/2008, respects fundamental rights and observes the principles recognised in particular by the Charter of Fundamental Rights of the European Union, including respect for human dignity and for private and family life, the right to the protection of personal data, the rights of the child, the right to freedom of religion and the prohibition of discrimination. This Regulation must be applied according to these rights and principles.

and

This Regulation shall be binding in its entirety and directly applicable in all Member States.

Commission Regulation (EU) No 1141/2011 of 10 November 2011 amending Regulation (EC) No 272/2009 supplementing the common basic standards on civil aviation security as regards the use of security scanners at EU airports

You can opt-out and get an (enhanced) hand search. If you decline, you are escorted landside and can't fly.
(If the officers actually comply with the regulations is a different question.)

From the "Security Scanners Direction 2015", Annex C, Part 14:

An individual who has been selected to be screened by security scanner may opt out of being scanned but only if the individual being screened agrees to be searched by an alternative screening method, including at least an enhanced hand search in private. That search may require the loosening or removal of clothing.

Department for Transport - Security scanners implementation information Security Scanners Direction 2015

Guess what they assume their programs do.
They assume that they complete successfully.

While on Windows, it seems to be a huge surprise to the program.
"Uuuh, it worked. Hmm, doesn't happen often, better get someone's attention..."