Hamas doesn't have many modern ATGMs like Kornet but it does have large quantities of PG-7VR (tandem-charge), which appear to be locally produced to some extent. These will not be able to destroy MBTs but will be effective against APCs and other vehicles. The range is limited to 100-200m but this can be effective in close combat in Gaza. This is likely what was used in that attack to destroy the Israeli vehicle (likely an APC).
Israel is sending large numbers of soldiers and equipment in tightly packed groups in narrow areas, Hamas will have a lot of opportunities to 'scoot and shoot' (pop out of tunnel near Israeli positions, fire ATGMs/RPGs, escape). This can be a nightmare for Israel.