The first paragraph and the first sentence ...
Starting sometime in 2024, Americans, Canadians, and residents of
dozens of other countries will be required to pre-register (using a
system called ETIAS) before they arrive in Europe.
... is not precise. This is an EU thing, not a Europe thing. Also incorrect in that it implies that ALL must apply for the ETIAS visa, when in fact there are a number of exemptions for individuals with other forms of visas and residency permits.
The second paragraph and the first sentence ....
ETIAS (European Travel Information and Authorization System) is a visa
waiver program that requires international travelers from a designated
list of countries (including the US, Canada, the UK, Australia, and
New Zealand) to pre-register before arriving in Europe's Schengen zone
(for more on which countries are affected, see below).
... is not precise. This is an EU program and not a Schengen program, and yes, they are different. And again, not all travelers need apply ... granted most, but still ...........
Paragraph five sentence two ...
Here's some good news: Once your ETIAS application is approved, you
can use it to enter Europe as many times as you like over a period of
three years (or until your passport expires) — provided you don't
exceed the existing Schengen limit of 90 days out of any 180-day
period.
... is not precise. As you dont use it to enter Europe (its an EU thing, not a Europe thing) and the Schengen limit may or may not apply as not every country in the EU is part of Schengen.
Otherwise extremely ..... I would suggest you go to the horses mouth: https://travel-europe.europa.eu/etias_en Well written and easy to follow. And I could be wrong, so use the official site.