It seems that you also have to mention the type of hardware wallet from Safepal that you are referring to. If what is in the highlight is closed-source, then Safepal X1 (
https://www.safepal.com/en/store/x1) is one of the open-source hardware wallets from Safepal (I have no affiliation with them).
The last time I read about this wallet was during its presales which was not quite long ago. I have not seen a review yet that the wallet is completely open source, but for now, we truly supposed to mention it as exception and the reason. The wallet is having bluetooth and not QR code for making transactions, can not be connected with other software wallet like Electrum. Is the Safepal software wallet open source?
I prefer an open source wallet that make use of well secure means of generating seed phrase, unlike the way Libbitcoin explorer that make use of random number generator that was said to be vulnerable. Who knows if there are close source wallet that are lazy and made use of Libbitcoin for their seed generation?
Open source wallets can have vulnerabilities, likewise close source wallet, like what that happen to Atomic wallet hack that happen this year that lead to over $100 of stolen coins. Any of the wallet can be vulnerable, but close source is far worse because thenoublic do not know the code that is used to build it just like j have mentioned before which I know is not new to you.
Because of how open source wallets are, and there are many bitcoin open source wallet that make use of secure means of generating seed phrase, there are too many of them, I will prefer to go for open source wallets.