Hi,
You can ignore these alerts, yes. You don't want to disable these plugins. They are necessary.
HikaShop is as compatible to J6 as it can be. At the moment, there are no known issues on Joomla 6 with the current version of HikaShop. So it is "fully compatible" and its plugins as well.
Still, it's always possible that an unforeseen issue pops up on your website when you upgrade to J6, in the same way to the issue I talked about in my previous message here, because we only had a limited amount of feedback on HikaShop on Joomla 6 for now.
So, as for any major version upgrade, I would recommend being careful about it.
And if you manage to find an issue with HikaShop on J6, report it and we'll fix it.