Because he is English, not American.
Answer (1 of 2): American : cow-bruh with the cow rhyming with slow and low not a lady bull. British : cobb-ruh In this example the British pronunciation follows the general rule of thumb that a vowel followed by a single consonant then a vowel is long, indeed this rule is the essence of the si...
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"American : cow-bruh with the cow rhyming with slow and low not a lady bull.
British : cobb-ruh
In this example the British pronunciation follows the general rule of thumb that a vowel followed by a single consonant then a vowel is long, indeed this rule is the essence of the silent e at the end of a word so that ‘run’ would become’rune’. To keep the vowel short, the consonant is doubled, as in ‘running’.
This is the same with ‘zebra’ (American : zee-bruh; British zebb-ruh)
Two consonants implies the vowel is short, cobb-ruh and zebb-ruh
In principle, this rule should also apply to ‘project’ (Am : proe-ject; Br proj-ect) and yogurt (Am : Yoe-gurt, Br : yogg-urt) as the single consonant should mean a long vowel. But the British buck the system and pronounce it with a short vowel.
Conclusion 1 : The Brits are right and the Yanks are wrong for cobra and zebra, the Yanks are right and the Brits are wrong for project and yogurt.
Conclusion 2 : If both Americans and British followed the rules of thumb, these would become proper rules which could be learned and everyone would be happy.
Please note that neither ‘both’ nor ‘proper’ follow the above rules while follow, rule, these and happy do."