I am from Sweden, and just received an official email confirming this.
The information is also on the official site, in Swedish:
https://www.playstation.com/sv-se/support/important-notice/
Edit: IGN article.
After Sony released the new webstore, people discovered that you could still access the old one via a specific URL. Someone on Resetera noticed this weekend that the workaround stopped working. Sony still hasn’t officially confirmed the rumors that the PSP, PSVita and PS3 store are officially closing in July/August, but this change helps the rumor’s credibility.
Edit: They’re closing the stores on those consoles too https://www.reddit.com/r/Games/comments/mfunbp/confirmed_playstation_store_to_be_closed_for_ps3/