If something as basic as a company intro & advertising literature are done in a 1/2-assed manner...no spellchecking/proofreading/lack of English grammar, etc...bottom line... reflects very poorly on the company.
If the firm is not diligent enough to produce literature free of errors, it would give me great pause regarding their diligence and attention-to-detail in any construction work. I’d be very hesitant to hire a company which can’t be bothered to ensure that the small stuff is done correctly.