Yes, "if" in those sentences is effectively taking the place of "although".
Those sentences would look perfectly fine if you saw them in writing. But in actual speech, that's not as common, and would probably be considered more formal.
In conversation, using "even though" or "despite" is more common. Examples:
Even though his style is simple, it's pleasant to read
Despite being simple, his style is pleasant to read.
Even though our profits are lower than last year, they're still extremely healthy.
Our profits, despite being lower than last year, are still extremely
healthy.