It's not specific to any current issue of new threads or new members, though it may have a side effect of dealing with some of them. However, such new posters that immediately start running afoul of major violations tend to be weeded out quickly. Those that fall into this category tend to be longer standing posters who, as described in the OP, cause these disruptions...then duck their head down for some time waiting for points to expire...to simply come back and repeat the cycle.
I will note, some of the members in my analysis that I discovered would've been subject to these harsher penalties have ultimately already gotten themselves banned in other ways. Had this rule been in place, it simply would've expedited that process, saving moderator time and forum angst of dealing with the habitual offenders.
Generally, no. Multiple violations may be identified in a post, and if those violations are of separate rules then they MAY be acted on concurrently (for example, if you flame someone AND you bypass the word censor in doing so). Typically this is either done by issuing the standard points for one of the infractions but noting the violation is for both, or going with a custom DBAJ infraction that notes both of the rule violations and gives you an enhanced point total but a total that would be less than infracting each thing separately.
What never happens is an infraction being issued for each violation in a post separately for full points; IE if someone violates the word censor, flames someone, and violates 9a's fair use rules all in one post, they would never be issued 3 separate infractions, each worth 3 points. One infraction noting all three would be issued for 3 points, or for some form of enhanced points that would be greater than 3 but less than the 9 (likely 5). This is a RARE occurrence.
Typically, if one infraction is clearly greater than the other, we'd only go with the greatest. For example, if someone made a post that qualified as Hate Speech and during it also flamed someone, they'd likely simply be hit with a 20 point hate speech infraction.