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They are talking here about mining pools I suppose since the biggest 4 mining pools account for more than 50% of validated blocks.

Also the word is "disrupt" so it means some time of chaos, the mining pools never tried to disrupt Bitcoin because they have no incentive to do so.

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That assumes they are economically motivated. As we've seen in recent attacks on other coins, if its a possibility for someone to burn the system down out of spite/malice then the economic incentive doesn't matter.

1. If half of Bitcoin users (hashrate-wise) wanted to disrupt the network out of malice ignoring their economic wellbeing, say a movement similar to GME/WSB, then they can disrupt it.

2. We can go into lower levels and find a number of ISPs specially level 1 ones being able to disrupt the Bitcoin network. Some other single points of failure I can imagine are common routers firmware.

Can Bitcoin never be disrupted? no, does it have mechanisms in place that make it unlikely to be disrupted? yes.

it is nothing about incentive. Let's say a mining pool wants to disrupt the bitcoin network, do you think that pool will keep its hashrate ? I don't think so.

Disrupt is creating chaos short term, I don't imagine it to last more than 1 hour, but that's enough to call it disrupt.

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