Is the statement that LN hot wallets will be less secure than non LN hot wallets correct?
Of course this depends a lot on the implementation you are using but generally the answer is yes.

LN wallet vulnerabilites = hot wallet vulnerabilities + LN protocol vulnerabilites


Here are the main additional issues coming with running a LN node:


You could be scammed by somebody releasing an old channel state
You announce to the whole world how much money you have on your node [this is optional and depends on whether you want your node to be routing other peoples payments or not]