California is gerrymandered but your data is flawed. 60% of people voting for one presidential candidate in a popular vote is a landslide in a state as large as CA. You only need a majority to win a seat, it's not inconceivable that this simply played out as expected in most districts
The equivalent data for Texas is also flawed. Although to be fair, the ratio in texas was around 1.3 : 1 (Trump : Harris) while in CA it was more like 1.5 : 1 (Harris:Trump) which is a much sharper ratio
This points out a major issue with gerrymandering, which is that it's difficult to measure how fair or unfair it is
you're correct its not a perfect comparison, however i'd wager a good amount that if we went county by county in California and Texas we'd still find California is more unfair overall.
the real core of this issue in gerrymandering is a lack of representation, obviously. and if you're in a Red county that is in a Blue district one avenue of democratic representation for you is just gone. poof. your rep will never represent the beliefs of you or those around you. and the same works in the opposite direction for Texas blue voters.
however if we take it a step further we often see why it tends to favor democrats a lot of the time, big cities. those cities vote blue, so you just extend the border of the district to chew up red territory that extends outwards from them. whereas its hard to draw a rural district into city territory and justify it. large cities should in theory be a single district, that makes sense at least. but they often aren't, they look like a crazy octopus of districts extending outwards as much as they can to water down rural and suburban votes.
obviously GOP run states also often exploit this and chop up cities to water down their votes with rural or suburban votes, texas would be an example of that as well as georgia historically. but America's great cities aren't by-and-large in GOP run states. Chicago, New York, Boston, LA, etc have always been blue and will remain that way seemingly forever.
i should also state as a centrist i dont blame either side specifically. its all legal, and its all a game to them. i dont see a grand conspiracy from liberals, i see a system thats been abused and in reality its given the dems an edge almost by accident, albeit a slight age.