I think I know what your doubt is.

First of all, "appears that it has" IMO is not idiomatic. The way I infer this is that this sentence is not correct:

Rohan appears that he has lost weight.

But this is correct : Rohan appears to have lost weight.

Basically you say that "someone appears to be something". You do not say "someone appears that..."

Secondly, in this sentence, even though Rohan is singular, we say "to have". But notice the verb - "appears" to singular.

Plants appear to have lost their color. - Here "appear" is plural. But notice "to have"
The rose flower appears to have lost its petals. Here "appears" is singular. But notice "to have".

So the verb agrees in number with the subject. But "to have" remains the same. And that is correct since "to have" is more of an idiomatic construction. It is not the main verb of the sentence.

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