As Geert pointed out, your current conditional will always be true.
An if() construct needs to be fed an expression.
You’re feeding it a valid array, so that’s true. Always.
So far this is basic PHP, regardless of whether in a WP environment or not.
As can be read in Chris_O’s comment
if ( is_category('some-cat') && is_tag('some-tag') ) {
// do something
}
will do the trick.
'some-cat' and 'some-tag' may be the category/tag slug, id or title.
The codex page on conditional tags explains the use of these rather well.
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