It really doesn't matter what one individual company says.
Brexit is clearly bad for Britain (that's if Britain even stays together in the aftermath) and ensures we'll essentially become a vassal state as Rees-Mogg (rather ironically) put it.
Not only will we no longer have the bargaining power of a big bloc, businesses will still have to follow almost all the EU rules in order to trade with them, rather than having different production processes for different regions and thereby becoming far more inefficient and uncompetitive, and on top of that will have the increased logistical problems that come from being outside the free trade area of your nearest mass-market.
It's a really really stupid move that all stems from politicians desire to blame anyone bar themselves for Britain's problems and the gullible public and their xenophobia lap it up.