He's addressing each party, not describing each party's beliefs.
Any comparison of the parties can't be done in good faith.
But it's a great way to lie about your political opponents to keep anything rational from being done about gun violence or other issues.
Plenty of prominent Democrats quotes here that say otherwise.
‘Defund the police’ is what you see on the signs at democrat protests.
When you get in a discussion, it’s not quite what they mean, but that just means it’s a stupid slogan where you have to redefine every word to get at what you mean.
Human politics and all…
It's very clear that Republicans don't actually believe that improving mental health or mental healthcare is actually a solution to gun deaths, but only use it as a distraction from improving gun regulations that are desired by over 80% of Americans, including a majority of gun owners.
Democrats on the other hand actually do understand that mental health issues are a part of the gun problem, and therefore provide solutions to tackle it both by improving mental health care access, as well as improving background checks to prevent those with mental health issues from accessing lethal weaponry easily.