Does anyone know if the 2020 Jazz is vulnerable to catalytic converter theft or has this problem been addressed?

All cars with catalytic converters can be targeted.

There were a load of thefts from cars on local housing estates over a few nights locally a few weeks back.

It wasn't just Hondas that were being targeted.

The cars I know of that had catalytic converters stolen were Nissan. Toyota, Vauxhall, Kia & Honda, they are cars I know of personally not from the media. 

 

A lot of the press that is banded about makes it sound like its just Honda models that are targeted.

They will steal the catalytic converter from any car they can.

 

There are several different ways to put them off targeting your car to make them look elsewhere.