Their grammar is as bad as their advice
Guyana passport provides visa free travel to more than 90 countries (British Commonwealth countries, Europe, South America, Caribbean), including major countries - Switzerland, Andorra, Bermuda, Bahamas, Panama, Hong Kong, Korea, and even to countries where a visa is required, travel with a Guyana passport is quite easy, as the visas are easily obtainable (full visa-free list is provided upon request). Republic of Guyana belongs to British Commonwealth what makes it as easy to travel worldwide as bearing British passport.
Amusingly the same grammar and eccentric idea is posted on this website
http://www.second-passport-citizenship.com/second_passport_guyana/second_citizenship_guyana.htmIt's utter drivel.
They are misinterpreting this
The following individuals can enter the United Kingdom without a visa:
As of right
* Citizens of Commonwealth countries who, although not British citizens, have the right of abode in the United Kingdom
In plain English you must be a Commonwealth citizen
AND have 'a right of abode'.
Without the 'right of abode' forget it.
This is what 'right of abode' means
You will have become a British citizen on 1 January 1983 (the date on which the British Nationality Act 1981 came into force) and so will have the right of abode in the UK if, immediately before that date, any of the following applied to you.
I won't detail the requirements, because anything happening after that date will not confer a 'right of abode' so a Commonwealth passport alone doesn't give you that right or enable you to visit the UK without a visa. As a UK passport holder I need a visa to visit Guyana.
It's simple to confirm here
http://www.ukvisas.gov.uk/en/doineedvisa/Select Guyana and it confirms that a visa is needed.
I very much doubt they'd even be able to get you a Guyanese passport but, as they don't understand anything about visas and visa requirements, it's not worth taking any notice of what they say.
Governments issue passports - not websites.