How exactly is the difference in rating from A+ to G in one year to be explained? Not in the sense of "there are new certifications/requirements", that is basically clear to me. However, I would be interested to know how such a stark difference can be explained?

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Look here: https://www.energie-experten.ch/de/wohnen/detail/neue-energieetikette-2021-in-der-schweiz.html

"Features of the new energy label 2021
The familiar rainbow colours of the efficiency classes from green (best class) to red (worst class) will remain.
The seven levels of the energy efficiency class scale are designated with the letters A to G. The classes A+ and A++ as well as A+++ disappear.
The requirements for all energy efficiency classes have become stricter. A good appliance that previously carried an A++ label now belongs in the new class B or C. It has not become worse because of this.
The efficiency classes have been defined in such a way that there will not yet be any appliances in the best class A when the new energy label is introduced. This leaves room for future, even better appliances. However, it is foreseeable that the first appliances will already be able to achieve the A classification today (e.g. washing machines and refrigerators).
The calculation method, the guidelines for the declaration and the measurement methods have been adapted. A comparison or direct conversion between the old and the new energy label is therefore not possible.
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How exactly is the difference in rating from A+ to G in one year to be explained? Not in the sense of "there are new certifications/requirements", that is basically clear to me. However, I would be interested to know how such a stark difference can be explained?