Hello,
The filter that we recommended for you before had some issues in your code https://prnt.sc/zZIzULBe8Kdp . Once we fixed it and wrote correctly it became to work for products but not for the one on first page ( https://prnt.sc/X4X16X-M9IxV )
The reason for such products was in plugin ‘
WooCommerce Product Add-Ons Ultimate’ that allows to create groups here ( https://prnt.sc/79qG7ScNrEHI ) and that product has such group which is the reason of no-working filter for button text. So after we disabled the plugin text started to work normally -> https://prnt.sc/JddYyJ8S4bBf that means you should contact to plugin’s author and find out why that filter does not work if their plugin is enabled.
Regards