Concord Catering has existed, in some form, since at least 1996.
The website for Concord Catering is http://concord-catering.ru/.
WHOIS lookups, which track when website domains are registered, have data on the domain for Concord Catering.
The NIC, on their .ru domain lookup, has concord-catering.ru registered since 1998.
state:REGISTERED, DELEGATED, VERIFIED
org:"Concord Management and Consulting" ltd.
Last updated on 2018-05-17T15:46:35Z
We can see, from the whois, that the domain
Was created in 1998 (see 'created' line) and has been maintained since then
Is under the organization of "Concord Management and Consulting" ltd. (see 'org' line)
Web Solutions concurs with this claim, having a create date on the domain registry of 1998-02-05T21:01:16Z (5 February 1998 21:01:16 GMT).
In addition, the Internet Wayback Archive has been snapshotting the page since 1998, its first entry on 5 December 1998.
From their about us page on the site, the company claims that their establishment year is 1996.
1996 год основания компании
Более 20 лет наши клиенты получают всё самое лучшее и совершенное. ...
and translated from Russian (with thanks to @Sashkello):
1996 - the year of company establishment
For more than 20 years our clients have been receiving all the very best and impeccable. ...
The implicit claim made by the lawyer, and by extension D'Souza, is that they didn't exist when the alleged activity occurred, thus it's a bullshit indictment. However, their own website, and registration data for their domain, proves that the company has been in business since the mid-to-late 90s. The lawyer could be doing all sorts of tricks to make it appear like the company didn't exist, and this "legal entity" argument could be along those lines, but that doesn't change the fact that Concord Catering has been in business for 20+ years.