Yes You can leave impressions in Flexitec. But you can leave impressions in any resilient floor with heavy appliances and furniture. Most people don't move their kitchens appliances, hutches Etc, around enough for it to matter.
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Installing since 1973
Support furniture with wide-bearing non-staining floor protectors. Ideally, protectors should be at least one inch in diameter, made of non-pigmented hard plastic and should rest flat on the floor. Use of non-staining felt protectors is also acceptable.
Did salepeople tell you this? Did you do this? This came right from some installation guidelines for flexitech flooring. Resilient flooring will make impressions