You can make a good argument that a state forcefully resettling ethnicities is a form of genocide (the Nazis did that, too, e.g. with german speaking northern Italian minorities).
But comparing that with the holocaust is just disrespectful hyperbole.
Holocaust had 6M jewish victims[1] (depending how you count). Current confirmed gaza death count is -as yet- ~65K [2], with projected ~600K at risk by year's end [3][4][5]. The original population of gaza was ~2M [6] which sets the upper bound to the crisis. (If you look at it as a % of population, it's quite a large number already.)
Of course, one can argue that if the allies had been able to intervene sooner, the holocaust would have been less severe. Obviously we'd like to demonstrate some lessons learned here.
A huge part of the Holocaust was the forced relocation of Jewish people* to concentration camps, which would have been (rightly) remembered as an inexcusable horror even if the killings in said camps hadn't been as extensive and inhuman.
* and Roma, and Armenians, and others - but that's less salient here.
But comparing that with the holocaust is just disrespectful hyperbole.