The PCI Standards Council does operate programs to certify organizations and technologies (like vulnerability scanners). To see the list go to the main PCI security standards web site and then click on the "Approved companies and providers" tab. (I cannot post the URL)
BUT, notice that SIEM/logging technologies like Splunk are not part of these programs and thus there is no "PCI validation" for these technologies. So, no, Splunk is not "PCI validated", but then again no SIEM/logging tool is even though they play a key role in PCI compliance.
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