Here are a couple possible scenarios:
1) The original run of OEM replacement struts really are bad. I managed to find a thread with people talking about this even back in 2005.
It's 2007, which happens to be the date code recently found on some of the OEM struts. The newest SVX is now 10 years old, and now many, many of them need new struts. Lots of owners/dealers are buying and replacing them, only to have them fail under warranty. This is costing Subaru a lot of money to replace these under warranty. Subaru realizes the issue, and looks into it. They determine that most/all of the struts on hand are bad. Decision time. They can keep taking their chances with selling the current stock, they can scrap them all and leave all the SVX owners out to dry, or they can make a new run. What have they got to lose? IMO 2007 would have been a great time to make a new run. They know that over time they will likely all sell as almost every SVX on the road will need struts within the next 5+ years. It's not like they are going to lose money doing this. This is also the point in time where many SVX owners realize that their car is getting too old to drive every day, and decide to go buy a new car. The last thing these people would do is go buy another Subaru after having to give up theirs because they couldn't buy a simple strut for it. IMO it would be a worse business decision to leave every SVX owner stranded with no strut options, just 10 years after production ended. That's a no-brainer, it's not like making re-run of struts that they've already made in the past is a big deal for a company that large. In fact, if they still have the original tooling lying around in a warehouse, it's a pretty simple operation.
or
2) A very small handful of people had the OEM replacement struts go bad. OF COURSE these people are going to go to an online forum and complain about it. Word spreads about the bad experience that a couple of people had. Nobody hears about all the other people who replaced them and didn't have issues. After all, who goes and posts on a forum about how their replacement parts are working like they are supposed to? Now every OEM strut thread is littered with people repeating what's been posted in previous threads. If only a small handful have failed out of the hundreds that have been purchased from Subaru over the last 10 years, that's a relatively small failure rate.
IMO, neither one of these is more outrageous than the other....
