When they write "Scientists have long predicted that this isotope is unusually stable", does that mean "unusually stable for unstable isotopes"? I.e. they expec

When they write "Scientists have long predicted that this isotope is unusually stable", does that mean "unusually stable for unstable isotopes"? I.e. they expected it to remain stable for considerably longer than it actually did, but that would still have been in the order of seconds/miliseconds/nanoseconds? The article is frustratingly light on concrete numbers, but if you look at Wikipedia (https://en.wikipedia.org/wiki/Isotopes_of_oxygen https://en.wikipedia.org/wiki/Isotopes_of_oxygen), the heaviest isotope for which the half-life was actually measured was 26O, which lasts 4.2 picoseconds.