Has the flight security briefing text changed?

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While the International Civil Aviation Organization (ICAO) requires airlines to provide a preflight safety briefing for passengers, the content requirements vary from regulator to regulator, and the script may vary considerably from airline to airline (and even from flight attendant to flight attendant). As such, you would well expect its wording to change over time, whether from internal or external influences. There are numerous pre-recorded and passenger-recorded preflight briefings available on YouTube which you can compare at your leisure.

In the United States, the content appears to be dictated by FAA Advisory Circular AC 121-24C - Passenger Safety Information Briefing and Briefing Cards. Under Appendix I: Part 121 Operations with Flight Attendants, the preflight message about oxygen equipment doesn't say anything about saying whether a loss of cabin pressure is likely or not:

(13) Oxygen Equipment. In accordance with § 121.571(a)(1)(v)(C), if the flight involves operations above 12,000 MSL, crewmembers must brief passengers on the normal and emergency use of oxygen. These instructions should include locating, donning, and adjusting the equipment; any action which might be necessary to start the flow of oxygen; and the prohibition against smoking during oxygen use. In addition, passengers should be advised to don their own oxygen masks before assisting children with their masks. The announcement should include the information that oxygen mask reservoir bags may not inflate, although sufficient oxygen is flowing into the bag. On smoking flights, passengers should be told to extinguish all cigarettes when the oxygen masks drop.

The EU regulation, AMC1 CAT.OP.MPA.170 (Passenger briefing), similarly mentions simply that

passengers should receive a demonstration of the following: …
(ii) the location and use of oxygen equipment, if required. Passengers should also be briefed to extinguish all smoking materials when oxygen is being used;

So whether the airline explicitly does or doesn't say a loss of cabin is "unexpected" seems to be up to the airline in those jurisdictions. It's possible that their lawyers or insurers wanted it removed in an attempt to reduce injury (and limit liability), or it may have been an attempt to reduce the length of the briefing, or it may be a flaw in training, or it may be something else; we can speculate endlessly, but it would simply be speculation. Write the airline and see if they respond.

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