That doesn't jive with my experience at all. I'm half-dutch, raised in England.

Dutch doesn't have the same intonation, has harsher pronunciations, and has a whole extra sound most English people struggle with (a rolled r).

The older generations also can't pronounce -thew very well as it's not a thing in Dutch, so struggle to pronounce my name, calling me Matchoo instead of Matthew. It still boggles my mind that my Mum would pick a name the Dutch can't pronounce.

The Dutch accent is also extremely noticeable to a native English speaker.

Ultimately, they're not the same at all as English is Germanic/Latin hybrid where half the words are French/Italian words, and half the words are Germanic/Dutch words.

Dutch is not.

You can usually tell by looking at the word and the end of the word.

Words like fantastic, manual, vision, aquatic, consume are all from -ique, -alle, -umme and will have similar words in French/Italian. The tend to be longer words with more syllables.

Words like mother, strong, good, are Germanic in root. The -er, -ong, -od words will all be similar to the German/Dutch words. Shorter, quicker to pronounce.