How do I test a difference between two proportions representing fatality rate for Covid 19 in Philippines and World (except Philippines)?
It is not a case of paired nominal data. Hence, Mc Nemar's test can not be applied to check whether there is a higher fatality rate   in Philippines ?. THE fatality rate is given for Philippines and world ( excluding Philippines ). As defined,  it is expressed as proportion. Therefore, t-test/z-test shall be appropriate given that you meet other conditions such as sample-size.