A CL title in any year is a great achievement, for Ajax who were not in a position to compete financially with the rest of Europe at the time, even more so, to then be a penalty shoot out away from repeating the achievement minus Rijkaard and Seedorf.
If you try to remove all context from a situation then you can be dismissive of almost anything accomplished in football.
And just because a manager is wrongly criticised for not winning a cup competition more than arbitrary "X" amount of times, doesn't mean that it is ok to then do it for other coaches.
At those.clubs that LvG was fired from, I bet if you asked him if he felt like he was backed in the market and his targets acquired he would probably tell you that he was, he absolutely wasn't backed here and in his own words, got his 4th or 5th choice routinely. Whether he is right or wrong to feel a certain way about us after that, I don't know. But I can certainly understand being backed and told the job you isn't up to standard and being able to accept that, rather than being asked to accept being the fall guy after not being backed and being shit canned hours after just having delivered a domestic title.